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 # The Logic of the Tripartite Synapse Model — v5
 *A synthesis of the principles the pseudocode enacts. This version is reorganized top-down: it
 opens with the single principle everything specializes, then descends through six categories, each
 presented as a facet of that principle rather than a separate idea. Where earlier versions built
 bottom-up toward a conclusion, this one hands over the key first and shows each category turning it.*
 *What changed in v5. The old "evaluation" phase is retired — it was always preparation aimed at
 the other scope. The ring is recut into three categories: ACTION, RECOVERY, PREPARATION. The
 obsolete subject-mapping (lateral/local/vertical) is dropped. New findings are folded in: the
 rhythm is (ACTION ⇄ RECOVERY) × many, then PREPARATION; every category spans all timescales; night
 PREPARATION replays the day ACTION with the same machinery; build and release compete within a
 component while material competes between components; there are two independent forgettings; and
 collaboration by day versus competition by night follows from the rivalry of each scope's currency.
 Nine categories are consolidated to six.*
 ---
 ## The Unifying Principle
 Watch one presynaptic bouton for a day and a night. By day it releases neurotransmitter, restocks
 its vesicles so it can release again, and — in the quiet after a burst — stocks a trace that records
 how much this release mattered. By night it does the same three things at a slower tempo: it changes
 its structure, restocks the material to change again, and replays the release as a probe to measure
 whether the change is still warranted. Nothing supervises it. It reads only its own state and the
 signals that reach it. What we call the synapse, the neuron, the memory, the organism is nowhere
 inside the bouton — it is only the name we give to many such boutons, coupled.
 That is the whole model in one instance. Stated generally:
 > **There is only the local component and its one repeating act. Everything we call a system — the
 > synapse, the neuron, the assembly, the organism — is that act, multiplied and coupled, and
 > described from outside. The act has one shape (act, recover, prepare) run in two directions
 > (outward by day, inward by night), and the relations between components are set by what is scarce.
 > Holism is real, but it is enacted by the coupling, never encoded in any part.**
 Every category below is this principle, turned to face one question: *What is a component?* (locality),
 *What is its act?* (the ring), *What are its two directions?* (the two turnings), *At what speeds does
 it act?* (the ladder), *How do components relate?* (scarcity), and *Who is in charge?* (causation —
 no one). None adds a new assumption; each specializes the one above.
 A note on language. This document does not say "the system." There is no system — only local
 components, contextualized by their neighbors. Where the phrase appears, it is inside quotation
 marks, naming the thing we are denying: an actor that stands above the parts, holds the whole, and
 acts on it. No such actor exists here.
 ---
 ## 1. Locality — The Only Thing That Exists Is a Local Component
 Everything the model contains is a local component: the bouton, the spine, the astrocytic process,
 the dendrite, the soma, the axon. The actors we call higher — neuron, astrocyte, organism — are not
 additional things. They are descriptions of many components' coupled activity, spoken from outside.
 This is the direct reading of the unifying principle, and the rest of the category is its mechanics.
 **A component reads only its own state and the signals that arrive.** It cannot read another
 component's interior, and it cannot read "the whole." When the bouton needs to know whether its
 release reached a responsive target, it does not inspect the spine; it waits for a retrograde signal
 the spine emitted. Coordination is never achieved by a component consulting a global state, because
 there is no global state to consult. It is achieved by signals crossing between components, each
 read locally and made to mean something by the local context that receives it.
 **Everything emits; nothing is a pure sink.** A component that only consumed would be invisible to
 the rest and could not participate in coordination. Even the leaves of the daytime chain — the
 bouton, the spine — emit: by day they emit fatigue upward and retrograde messages laterally; by
 night they emit freed material into the shared pool and demand upward. To exist in the model is to
 be readable, and to be readable is to emit.
 **Coupling is openness, and openness is bounded.** A component is open — it takes in signals and
 supply, gives out signals and product — but its openness is bounded by what it can physically
 reach: its own cleft, its own supply lines, the neighbors it is wired to. It is neither sealed (that
 would make coordination impossible) nor unbounded (that would make it the whole). The bounded
 openness is what lets many local components compose into something we can describe as a whole
 without any of them being that whole.
 **Holism is real but only described.** The re-evoked pattern at night, the neuron's total activity,
 the memory a synapse carries — these are real. But they are not stored anywhere. The pattern is not
 in any component; it is what happens when many primed components ignite each other. The neuron's
 "excitability" is not computed by anyone; it is the coincidence of many components' own lowered
 thresholds. Holism is enacted by the coupling and read off by us as observers — it is never encoded
 in a part, because if it were, that part would be the system, and there is no system.
 ---
 ## 2. The Ring — One Act in Three Phases
 The local component's act has one shape, and it is the same shape everywhere: **ACTION, RECOVERY,
 PREPARATION.** This is the specialization of the principle to the question *what is the act?*
 **The three phases.**
 - **ACTION** is the component's defining deed — the thing that makes it the component it is. The
  bouton releases; the soma fires; the spine responds; the axon and dendrite propagate. Action is
  the only phase that spends irreversibly and reaches outside the component.
 - **RECOVERY** is the fast alter-ego of action: it restores the capacity to act again. Vesicles
  refill, sodium channels de-inactivate, calcium clears. Recovery undoes the local depletion the
  action caused, so a next action is possible. It looks backward — it repairs what was just spent.
 - **PREPARATION** shapes what comes next. It faces two futures at once: the next action in this same
  scope, and the action of the *other* scope. Setting the release machinery for the next spike is
  preparation for this scope; stocking the tag that the night will spend is preparation for the
  other. Preparation is provisioning, not judging — which is why the old "evaluation" phase was a
  misnomer and has been retired. Depositing a trace does not render a verdict; it lays down a
  provision that a later phase may or may not draw on. What we once called evaluation was always
  preparation aimed at the other scope.
 **The rhythm is (ACTION ⇄ RECOVERY) × many, then PREPARATION — then again.** The act is not one pass
 through three phases. Action and recovery alternate rapidly — a tight inner loop, release-and-restock
 many times over — and only when that alternation subsides does preparation run, punctuating the
 bout and setting up the next. A spike train is exactly this: release ⇄ refill, release ⇄ refill,
 then, in the sustained quiet, the preparation that stocks the tag and tunes the next train. The
 inner loop is fast; preparation is the slower punctuation.
 **Every category spans all three timescales.** The three phases are not three speeds. Each phase is
 a kind of work — deed, restore-capacity, provision — and each kind happens fast, medium, and slow.
 Preparation especially is multi-timescale: it contains a fast loop (probe and restock), a medium
 adjustment (tuning the release machinery from the tag), and a slow settling. A category names *what
 kind* of work, never *how fast*.
 **Action is always local; recovery and preparation may be contextual.** A component necessarily has
 its own action — the deed just is the local event occurring in it, and it cannot be performed on
 another's behalf (that would be signalling, not acting). But the recovery and preparation of an
 action can live in other components. A calcium channel's action is letting calcium in; its
 evaluation-and-preparation live in the presynapse and above. So the ring is a property of *coupled
 components*, not of the individual: **the ring must close — every action recovered from and prepared
 for — but no single component need run all three phases itself.** What is necessary is the closing
 of the ring, not its co-location.
 ---
 ## 3. The Two Turnings — Day and Night
 The one ring is turned in two directions. This specializes the principle to *what are the
 component's two scopes?* — and it is where the model's deepest duality lives.
 **Two contextualizations, two currencies.** By day the component faces outward, against the world
 (the cleft); its currency is information — cheap, gathered passively, and non-rival (see category 5).
 By night it faces inward, against the economy; its currency is material and energy — scarce,
 conserved, and rival. The component does not know it is in "day" or "night" as a global state; each
 turning simply runs against whatever environment is present, and the environment differs.
 **The rotation: the same physical event is a different phase in each scope.** This is the sharpest
 form of the duality. Neurotransmitter release is the day's ACTION — the outward deed. The *same
 release*, run at night, is PREPARATION: the component releases not to transmit but as a probe, to
 replay a behavior and measure how much it participates in the re-evoked pattern. And the structural
 change, which the day can only *mark* (the tag is an inert claim pointing at a restructuring that
 never happens by day), is the night's ACTION — its irreversible defining deed. So the defining act
 of one scope is the measuring-instrument of the other: release is day-action / night-preparation;
 restructuring is night-action / day-inert-mark. The scopes do not merely run the ring in two
 directions — they swap which event is the deed and which is the provisioning. Because it is a ring,
 each scope simply enters at a different phase.
 **Night PREPARATION replays the day ACTION — the same machinery.** Because preparation-at-night is a
 *replay* of the behavior, it runs the very code the day action runs: the same release, the same
 capacity and vesicle checks, the same endurance deposit into the *same* trace. Endurance discovered
 in replay is as real as endurance discovered in behaving. Only two things differ: there is no
 dopamine (significance is already settled), and the released transmitter is a probe — it carries the
 pattern onward to the next component and its own trace is read as participation. The action machinery
 is written once and serves as the deed by day and the measurement by night.
 **The tag is the payload that crosses between the turnings; the fatigue loop is the switch.** Each
 scope's PREPARATION mints what the other scope will consume. Day-preparation mints the tag — a
 token of confirmed significance — which the night spends on structure. Night-preparation measures
 participation, which gates that spending. The tag is one token with three roles: by day it is the
 significance bridge; at night it lowers the component's own threshold so its pattern can re-ignite,
 and it funds the build, a slice at a time. Distinct from this payload handoff is the *switch* — the
 fatigue loop that decides *when* a component crosses between scopes. Activity accrues fatigue; a
 single continuous integrator (the one actor that never sleeps) reads the aggregate fatigue and emits
 a pressure; when a component's own activity falls and pressure is high, it crosses into night; when
 pressure discharges, it crosses back. No scheduler; no clock. The switch says *when* to turn; the
 tag says *what* crosses when it turns. One ring, two turnings, stitched by the tag and switched by
 fatigue.
 **Two independent forgettings.** Because night ACTION is build ⇄ release (category 5), two distinct
 things can be lost, by two distinct mechanisms. *Structural pruning* sheds built structure a
 component no longer uses — driven by low participation, regardless of any tag it holds. *Intention
 decay* is the tag itself decaying unspent — a planned strengthening that never found the
 participation to license it. The tag is patient: it is sliced by building and never touched by
 releasing, so it survives across non-participating cycles and cashes in when its pattern finally
 re-evokes. Disuse prunes structure; unspent intention fades on its own slow clock. The two are
 independent, and both are forgetting.
 ---
 ## 4. The Timescale Ladder
 Orthogonal to the ring is the ladder of timescales. This specializes the principle to *at what
 speeds does the component act?* The ring says *what kind* of work; the ladder says *how fast*; they
 compose — every phase of the ring occurs at every rung of the ladder.
 **The rungs.** FAST (milliseconds to seconds): the immediate trace a single action leaves. MEDIUM
 (seconds to minutes): occupancy and evidence — the running average of fast traces, and the
 eligibility climbing toward a tag. SLOW (hours): the tag, the consolidation bridge. PERSISTENT
 (written only at night): the structural ceilings, and the two conserved stocks — energy, which does
 not return, and material, which does.
 **A tier's timescale is set by both its creation and its decay.** A fast trace is deposited as a
 point event and relaxes in milliseconds. A medium trace ramps while a condition holds and settles
 over minutes. The timescale is not a label attached to a variable; it is the joint consequence of
 how the variable is written and how it fades. This is why the same climb appears in every component:
 each action leaves a fast trace; the average of fast traces over seconds fills occupancy (short-term
 strength); the average of that average over minutes, gated by dopamine, raises the tag. Occupancy is
 the fast-and-medium memory of participation; the tag is its slow, validated distillate.
 **Evidence ascends the ladder; capacity descends it.** By day, information climbs from fast trace to
 tag — evidence accumulating upward. By night, capacity is written downward from the tag into
 persistent structure. Each rung also has its own failure meaning, set by its timescale: a fast pool
 running dry is transient depression; a medium pool constrained is a standing endurance need; a
 persistent ceiling reached is a structural limit. Depletion and recovery at each rung mirror the
 creation and decay of its trace — the same timescale governs both the evidence and the capacity at
 that level.
 ---
 ## 5. Scarcity Decides — Collaboration by Day, Competition by Night
 How components relate to one another is not an independent fact; it follows from what is scarce.
 This specializes the principle to *how do components relate?* — and it unifies conservation,
 selection, and the collaboration/competition character of the two scopes into one causal chain.
 **Two conserved currencies, two rules of flow.** Energy ratchets: it is spent irreversibly, the
 arrow of time in the model — a component that burns energy into structure cannot get it back.
 Material circulates: it is freed by one component and reclaimed by another, conserved as it moves.
 Scarcity of both forces choice — two ceilings (structure and endurance) compete for one finite
 night pool, and what is not maintained drifts back down.
 **Rivalry of the currency sets the relation.** By day the currency is information, which is
 *non-rival*: a bouton releasing glutamate does not use up the spine's ability to receive it; a trace
 here does not deplete a trace there. When producing for others costs nothing, the natural relation
 is **collaboration** — and the day is exactly that: each component acts so the next can act, releasing,
 integrating, clearing, passing activity along the chain, co-producing the pattern and the tags. By
 night the currency is material and energy, which are *rival and conserved*: every unit one component
 builds into its structure is a unit another cannot have, and the total is capped. When what one takes
 another loses, the natural relation is **competition** — and the night is exactly that: components
 contend for the shared pool, build what they win, and free what they shed back into contention.
 **But night's competition is adjudicated by collaboration.** The relation is subtler than "day
 collaborate, night compete." The replay that arbitrates the night's competition is itself a
 collaborative act: a pattern re-evokes only if every component along its loop is primed and ignites
 the next — mechanical coherence, a collaboration all the way around, one un-primed link breaking it.
 Participation — the measure that gates who gets to build — *is* a measure of successful collaboration
 in that re-enactment. So a component earns its share of the scarce material in proportion to how well
 it collaborated in replaying the pattern. Collaboration is primary in both scopes: by day it
 *produces* the shared, non-rival good; by night it *adjudicates* the competition for the rival one.
 The register is economic, not martial — components do not fight; they contend for a conserved
 resource, and the contention is settled fairly by a collaborative criterion.
 **Two competitions at two loci.** Within the night, competition appears twice, cleanly separated.
 *Within* a component, build and release contend over its own structure, arbitrated by participation:
 high participation builds (funded by the tag, a slice per cycle), low participation releases (freeing
 material, the tag untouched), and in between the component holds. *Between* components, this one and
 its peers contend for the shared material and energy during recovery. The internal tension (grow or
 shrink?) is settled by the replayed pattern; the external tension (can I get material?) is settled by
 contention with neighbors. Selection under scarcity is the sum of these: what survives a night has
 both earned its tag by day and won its material by night, and what neither participates nor is
 maintained returns to the pool. Selection is not a judge's verdict; it is what scarcity leaves
 standing.
 ---
 ## 6. Causation Circulates — Emergence Up, Constraint Down, Command Nowhere
 The final category specializes the principle to *who is in charge?* — and the answer is no one.
 Causation moves in two directions across the coupling, and neither is command.
 **Emergence ascends; constraint descends.** By day, evidence and activity emerge upward: components
 act locally, and their emitted activity is what a higher description (the neuron, the assembly) is
 *made of*. Nothing reaches down to make them act. By night, constraint descends: a higher actor
 broadcasts a bound — a renormalization target, a downscale factor — but it does not reach in. It
 emits a signal; each component reads that signal and scales *itself*. The neuron never edits a
 synapse; it announces a total, and the synapses each renormalize their own structure against it.
 **No actor authorizes its own restructuring.** A component cannot open its own night. It is *put in
 position* by the actor above — which holds an aggregate the component cannot see and opens a window
 the component cannot open — and then, within that window, the component acts locally on its own
 state. The soma cannot decide within the soma which of its synapses matter; the synapses decide that
 locally, by their own thresholds. And the synapses cannot ignite their pattern alone; the soma's
 firing does that. Each is put in position by the other; neither reads the other's interior. This is
 the recursive grant: act locally, be enabled hierarchically.
 **Command is nowhere.** There is no actor that both holds the whole and acts on it — that would be
 the system, and there is no system. What looks like top-down control is always a broadcast constraint
 scaled locally; what looks like bottom-up assembly is always local emission summed from outside. The
 neuron that "renormalizes" only announces a number. The assembly that "replays" is only coincident
 local thresholds propagating through coupling. Causation circulates — up as emergence, down as
 constraint — but it never concentrates into command. This is the unifying principle in its final
 form: because there is only the local component and its one act, there is no one to be in charge, and
 the whole is enacted by the parts, never encoded above them.
 ---
 ## Coda — The Six as One
 Read downward, the six categories are one principle refracted six ways. A component is local
 (1); its act has one shape, the ring (2); the ring turns in two directions, day and night (3), at
 every rung of the timescale ladder (4); the relations between components are set by what is scarce,
 collaborative where the currency is free and competitive where it is conserved (5); and causation
 circulates between components without ever concentrating into command (6). Remove any one and the
 principle loses a facet; none stands apart from it. There is only the local component and its one
 repeating act — and everything else is that act, multiplied, coupled, and described from outside.
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 # Logic Principles of the Tripartite Synapse Model
 These are the principles that govern the model's logic — not the syntax in which it is
 expressed, but the reasoning that shapes every variable, every behavior, every transition.
 A note on language. This document does not say "the system." There is no system — only local
 components, each reading arrived signals and acting on its own state. "System," "whole,"
 "network," "the organism's memory" are names applied from outside, by us, describing what
 coupled local components do together. The first principle states this; the rest honor it by
 never speaking in the voice of a whole that does not exist. Where a sentence seems to want "the
 system does X," it is rewritten as "local components, contextualized thus, do X locally" —
 because the form of the document should enact its central claim, that locality goes all the way
 down and all the way up, with no privileged vantage anywhere inside.
 The nine categories run foundation-first. The closing category — the Three-Phase Ring — is the
 integrator: it shows how a single cycle of ACTION, EVALUATION, and PREPARATION, run locally by
 every component and turned in two directions (outward by DAY, inward by NIGHT), is where all the
 flows the earlier categories describe actually happen in time. It comes last because it uses
 everything established before it. Its sharpest claim: a phase is a *role*, not a fixed event, so
 the same physical machinery — a release, a structural change — serves as ACTION in one scope and
 EVALUATION in the other, and the two scopes enter the ring at different phases. A vocabulary note
 on motion: causation *circulates* across scales (category VI); the ring *turns* across phases
 (category IX). Two different loops, two different words, kept distinct.
 ---
 ## I. There Is No System; Holism Is Real but Only Described
 **There is no system — only local components.** Nowhere in the model is there a controller, a
 global plan, a representation of the whole, or a vantage from which the whole is seen. There are
 only components, each reading the signals that physically reached it and acting on its own state.
 Every behavior is local; every evaluation uses only local state and arrived signals; every trace
 is a local record; every commitment a local draw on a shared pool. "System" is our word for the
 aggregate, spoken from outside. No component is the system, occupies its standpoint, or can read
 it — not the smallest bouton and not the highest integrating actor.
 **And yet what we describe as holism is real.** Memory, rhythm, selection, consolidation,
 sparsification — these are real behaviors, not illusions. The puzzle is that they are real
 without any whole existing to bear them. The resolution: they are *enacted* by coupled locals,
 never *encoded* in any one of them or in any representation. The holism is in the doing — the
 ongoing competitive, signal-mediated, scope-alternating process of many local components — not
 in any part and not in any model the parts contain.
 **What couples the locals is what we then describe as a whole.** Three couplings do all the work.
 *Shared pools*: the only thing every component touches is the finite resource it competes for;
 when one draws, the others have less, when one returns, the others have more — local actions
 become mutually consequential through a common, capped resource. *Cross-scale coincidence*: a
 lasting change requires confirmations from larger scales that no component can produce for itself,
 so every lasting change records an agreement across scales that no single scale authored.
 *Signals*: components cannot read each other, but they emit and receive, so they are coupled
 without any one gaining access to another's interior. Through these three, purely local action
 acquires what we describe — from outside — as global organization.
 **The properties we call holistic belong to no component.** Rhythm, equilibrium, memory, the
 joint selection for significance-and-sustainability — none exists in any single component. They
 are descriptions of the coupled population over the DAY/NIGHT alternation. The gap between "what
 a component knows" (only its own state) and "what we describe the population as doing" (choosing
 what to keep) is not bridged by any component knowing more. It is bridged by the coupling itself.
 Understanding, here, is enacted, not encoded — and "the system understanding" is only ever our
 shorthand for coupled locals enacting, faithfully local at every step, holistic only in our
 description.
 **Even the cycle is local.** Each component runs its own three-phase ring (category IX), its
 phase boundaries set by its own trace decays, not by any shared clock. There is no global cycle
 any more than a global controller — only many local rings, loosely coupled through shared pools
 and signals, which we describe together as "the rhythm." The turning is real in each component;
 the collective rhythm is our description of many local turnings.
 ---
 ## II. Two Contextualizations, and the Loop Between Them
 **DAY and NIGHT are not two phases of a system; they are two contextualizations of the same
 local components.** A component does one kind of thing always: it reads arrived signals and acts
 on local state. What changes between DAY and NIGHT is the *context* that fixes what those signals
 mean, who the component's counterparties are, and what is scarce. By "DAY" we name the
 contextualization in which the relevant environment is the external world and the component's
 information is about exogenous events. By "NIGHT" we name the contextualization in which the
 relevant environment is the internal economy and the information is about endogenous
 resource-state. The component cannot tell which it is in — it has no access to "the scope" any
 more than to "the system." It reads local signals, and context makes them mean what they mean.
 **Each contextualization has its own environment and its own information.** NIGHT is not the
 absence of an environment — it is interaction redirected from the world to the self. By day a
 component interfaces outward, perceiving sensory-driven events and reward; by night it interfaces
 inward, perceiving how much resource reached it, what its peers are claiming, what coheres. Both
 are full perceive-act loops against a real environment. Resource levels and demand-signals are
 the night's perceptual field exactly as glutamate and dopamine are the day's. "Internal" and
 "external" are relative to the subject one fixes; from a component's own standpoint there is only
 "my environment" — the signals reaching me — which happens to be the world by day and the economy
 by night.
 **A component is thus two contextualizations sharing one structure.** By day it is an
 environmental interface; by night an economic agent. The two share only the structure, and the
 structure is exactly what carries between them: the night-agent builds the ceiling the day-
 interface will operate within, and the day-interface generates the evidence (the tag) that
 authorizes the night-agent to build. The tag is information becoming a resource-claim at the
 boundary — the single unit that crosses from the day's information-context to the night's
 resource-context.
 **The move between the two is an emergent local transition, not an imposed clock.** There is no
 global day/night switch. Each component enters its NIGHT when its own activity is low and an
 arrived sleep-pressure signal is high, and returns to its DAY when that signal falls. Both
 conditions are read locally — own activity, arrived signal — so the transition is itself a local
 decision. Components therefore cross over at different times: a wave, not a switch (local sleep).
 The signal that carries them is itself the product of locals: activity generates fatigue; fatigue,
 integrated by one component (the hypothalamic actor) that does nothing but integrate fatigue and
 emit pressure, raises sleep-pressure; high pressure plus a component's own quiet opens its
 restructuring window; restructuring discharges fatigue; discharge lowers pressure; the component
 re-enters DAY. DAY and NIGHT are the two phases of one homeostatic loop the local components run
 on themselves — neither imposed from outside nor scheduled from above. The component never knows
 it is "in NIGHT"; it reads a signal level and its own activity, and what results we call night.
 **The mechanistic root of the alternation: behavior and restructuring exclude each other.** A
 component cannot rebuild its structure while it is busy behaving — the two compete for the same
 substrate. Only when its activity is low does it have the access to its own architecture that
 restructuring requires. The brief low-activity gaps within a day permit small adjustments; the
 sustained, widespread quiet that the sleep-pressure signal creates permits the large ones. NIGHT
 is not an arbitrary time for consolidation — it is the condition under which consolidation is
 *possible*, because quiet is what grants a component access to itself.
 **Two distinct couplings join the scopes — do not conflate them.** The scopes are connected in
 two independent ways. The *fatigue loop* is the **switch**: it controls *when* a component crosses
 between DAY and NIGHT (activity → fatigue → sleep-pressure → transition), a purely temporal
 control carrying no content. The *evaluation handoff* is the **payload**: it passes *what* each
 scope leaves for the other (the tag minted by day's evaluation, consolidated by night; the
 structure minted by night's evaluation, read by the next day — see category IX). One says when to
 switch; the other says what crosses. A reader who merges them loses the fact that a component
 could switch scopes with nothing to hand off (a quiet day leaves no tag) or hold a rich payload
 that waits several switches to be honored (a tag consolidated over several nights). Switch and
 payload are orthogonal.
 ---
 ## III. Locality and Signals
 **Only local evaluation.** Every decision a component makes — to act, to deposit a trace, to
 register an interrupted success — uses only information physically present in it. It cannot read
 another component's interior. The presynapse does not know the postsynapse's calcium; the
 dendrite does not know which distal spines are active; the astrosynapse does not know whether the
 postsynapse is waiting. Each judges from its own state alone.
 **A component cannot read the whole, either.** The completion of locality: not only can no
 component read another's interior, none can read "the system," "the scope," or the global state.
 There is no aggregate vantage available anywhere inside — not even to the integrating actors, who
 read only the summed emissions that reached them and emit signals in turn, with no more access to
 the whole than a bouton has. Locality holds up the hierarchy as strictly as across it.
 **Cross-component influence travels only as signals that arrive and become local.** Information
 crosses a boundary only by being emitted — feedforward transmission, retrograde messengers,
 neuromodulatory and sleep-pressure broadcast, the demand and recycled resource of the night
 economy. A signal in transit is invisible; a signal that has arrived is local and can be read.
 Downstream reaches upstream by emitting; upstream never reaches into downstream. Every coupling
 in the model is of this form — an emission that becomes, on arrival, another component's local
 state.
 **Everything emits; nothing is a pure sink.** No component only consumes. Each, whatever it
 receives, emits something a neighbor will read — its transmitter, its retrograde feedback, its
 fatigue, its demand, its recycled material, or simply its activity for an integrating actor to
 sum. The direction of emission reverses with context (see the two Logic panels): outward and
 downstream by day, inward and upstream by night. But the invariant holds in both — there are no
 leaves and no sinks, only a reversal of which way "out" points.
 ---
 ## IV. Resource and Conservation
 **Nothing is free.** Every behavior consumes a resource. There is no operation that does not draw
 something down. This is not a constraint added on top of the logic — it is its foundation.
 Selectivity, competition, and forgetting all follow from the single fact that resources are
 finite.
 **Resources are redistributed, not created.** The pools are bounded by external ceilings. Within
 them, resource is only moved — from one site to another, from a dismantled structure back to the
 pool. No internal process manufactures capacity; it only reallocates. A gain anywhere is paid for
 by a loss elsewhere — coupling that is not designed but is the automatic consequence of drawing
 from a common pool.
 **Two resources, two conservation laws.** Energy is a flow — produced and consumed, gone after
 use. Material is a stock — incorporated into structure and recovered when structure is dismantled.
 Different sources, different recovery. A behavior can be energetically affordable yet materially
 limited, or the reverse. Keeping them distinct is what makes the accounting honest.
 **Material circulates; energy ratchets — energy is the one irreversible flow.** This is the sharp
 form of the distinction, and it is the arrow of time. Material cycles indefinitely: spent into a
 ceiling, recovered when that ceiling decays, returned to be spent again. Energy does not. It is
 produced fresh at the roots, burned irreversibly on the work of building and behaving, never
 recovered. Everything else cycles or relaxes — traces decay and reform, occupancy fills and
 drains, material recycles — but energy only ever goes down per unit produced, capped externally by
 glucose. The total learning the local components can ever do is bounded by their lifetime energy
 throughput, and no internal cleverness lifts that bound. The irreversibility of energy is what
 makes them age.
 **Every economy has a single capped root.** Each resource traces to one producer with a hard
 ceiling — the astrocyte cell body for synaptic energy, the soma for neuronal material. Everything
 downstream competes for shares of that capped production. The ceiling is set from outside and is
 the ultimate arbiter of how much can be done.
 **Scarcity is what forces choice, and choosing is learning.** What is consolidated is the outcome
 of bounded demand (the standing tags and endurance needs) meeting bounded supply (the energy and
 material produced each night), and the match need not clear — a night may run out of energy before
 it runs out of demand. Unmet demand is not discarded but carried forward and retried. The
 selective pressure is, at bottom, this repeated failure of supply to fully meet demand: it is
 *because* not everything can be afforded that there must be choosing, and the choosing is the
 learning.
 ---
 ## V. The Timescale Ladder
 The spine. Every quantity sits on one of four nested tiers, and timescale is not incidental to it
 — timescale *is* its meaning.
 **Four tiers.** FAST traces (ms–s): residual calcium, synaptic current — the immediate response.
 MEDIUM occupancy and evidence (s–min): the filled receptor surface and channel coupling, the
 accumulating possible-tag, the endurance need. The SLOW tag (hours): the validated bridge to
 consolidation. PERSISTENT capacity (written only at night, drifting over days): the structure and
 budget ceilings. A quantity's decay constant is what it means — a fast-decaying quantity is a
 momentary signal, a slow one a commitment, a non-decaying one a capacity. Putting two timescales
 in one variable destroys both meanings, which is why a quantity carrying both a momentary and a
 lasting role is split into two.
 **Capacity and occupancy are two rungs, not a separate principle.** What was once stated as
 "night builds containers, day fills them" is simply this: the PERSISTENT tier is written at night
 and bounds the MEDIUM tier, which fills by day within it. The same physical quantity — receptor
 count, vesicle coupling, fuel level — has a fast/medium component (how full, occupancy) and a
 persistent component (how big, capacity), governed by different processes at different tiers.
 Short-term change is occupancy; long-term change is capacity; they never do each other's job.
 **Two capacities, two drives, one pool.** Structure is the capacity for strength — how powerfully
 a behavior can act. Budget capacity is the capacity for endurance — how long it can be sustained.
 Both are persistent ceilings, both filled competitively at the medium tier, both drawn from the
 same finite material and energy, so strength and endurance compete. A ceiling of either kind is
 never free even by day: filling it costs a competitive share of a shared pool, and a high ceiling
 makes a large standing claim satisfiable only by out-competing neighbors. Capacity that cannot be
 filled is wasted.
 **Structure shapes form, not just maximum.** A ceiling does not merely cap — it conditions the
 transfer function at every moment. Tighter calcium-channel coupling makes each spike more reliably
 coupled to release; more anchoring slots convert each pulse more faithfully to current; tonic
 co-agonist keeps the gate primed. The persistent tier shapes the quality of behavior continuously,
 not only its peak.
 **The tiers are a ladder: each rung's output is the next rung's input, in both directions.**
 *Evidence ascends* — fast traces accumulate into medium evidence, which bridges (on validated
 coincidence) into the slow tag, which commits at night into persistent capacity; nothing reaches
 a slower tier without accumulating through the faster ones. *Capacity descends* — persistent
 structure bounds medium occupancy, which bounds fast behavior; the ceiling at each level was set
 by the level above, on a slower timescale. Both the strength pathway (trace → possible-tag → tag
 → structure) and the endurance pathway (trace → endurance-need → budget ceiling) are the same
 upward climb, differing only in what validates it: associative dopamine for strength, homeostatic
 fuel-shortfall for endurance.
 **A pool's recovery timescale is what its exhaustion means.** The ladder governs pools as well as
 traces. A *fast* pool (the readily-releasable vesicle pool) depletes and recovers fast, so its
 shortfall is transient — short-term depression, self-correcting once activity slows. A *medium*
 pool (operational budget) recovers at the medium scale, so its shortfall is a standing constraint
 worth recording as endurance evidence. *Persistent* capacity changes only at night, so its
 "shortfall" is a structural limit unfixable in the day. This is why a behavior's failure mode can
 be read off which pool ran dry: fast-pool exhaustion is depression, medium-pool exhaustion is
 endurance evidence, persistent limit is structural. Depletion-and-recovery is the pool-side mirror
 of creation-and-decay — drawn down by behaving, refilled toward a ceiling — and in both, the
 timescale is the meaning.
 **The ladder is structure; the ring is timing; they are orthogonal and they compose.** The ladder
 (this category) is about *tiers of persistence* — which quantities last how long, and how capacity
 descends while evidence ascends. The three-phase ring (category IX) is about *phases of a cycle* —
 when a component acts, evaluates, and prepares. These are independent axes: one could have the
 ladder without a cyclic ring (a pure feedforward hierarchy) or a ring without four tiers (a cycle
 at one timescale). They compose in a specific way: the ring's phases are *where the ladder's flows
 occur*. ACTION injects at the bottom of the ladder (deposits the fast trace). EVALUATION enacts
 the up-flow (works the fast trace into medium evidence and the slow tag). PREPARATION enacts the
 down-flow (reads the descended capacity as the readiness the next action runs within). So the two
 pictures are not two names for one thing — the ladder says what persists, the ring says when each
 persistence-flow happens, and evaluation-is-up / preparation-is-down is where they meet.
 ---
 ## VI. Causation Circulates — Emergence Up, Constraint Down, Command Nowhere
 The model has causation in two directions, and the whole point is that they coexist without
 either becoming control.
 **Emergence flows up.** What we describe as global organization — sparsification, normalization,
 winner-take-more, the allocation of fuel — is nowhere computed centrally. It emerges from many
 local components drawing on shared pools. No allocator decides which synapses to fuel; the
 synapses' own demands, each purely local, competing for capped production, produce the allocation.
 No allocator exists; the allocation is real. The local emissions sum, through the pool, into an
 aggregate no component authored.
 **Constraint flows down.** An integrating actor holds an aggregate its constituents cannot see —
 total weight, territory demand, accumulated fatigue — and broadcasts it back as a constraint each
 constituent then interprets locally. The neuron, summing emitted activity it never reads interiors
 to obtain, broadcasts a renormalization that each component applies to itself. This is top-down,
 but it is constraint, not command: the higher actor sets a bound; the lower still decides locally
 within it.
 **Command exists nowhere.** This is the load-bearing claim. The downward direction never becomes a
 higher component deciding for a lower one, nor a lower one deciding for itself in isolation. No
 actor authorizes its own restructuring — each is put in the position to restructure by the actor
 above it, which holds the aggregate it cannot see and opens the quiet window it cannot open, then
 *broadcasts*, never reaching in. The soma cannot decide within the soma; it is put in position by
 the neuron — which is itself put in position by the integrated fatigue, which is itself the sum of
 what the components emitted. Causation circulates — up as emergence, down as constraint — and the
 circle closes with no controller anywhere on it. Every integrating actor is itself only another
 local component reading summed arrived signals; none is "the system" in disguise.
 **The recursive grant repeats at every scale.** The relationship is the same all the way up: the
 astrosynapse is put in position by the astrocyte; the soma, bouton, spine, branch, axon by the
 neuron; the neuron and astrocyte by the hypothalamic fatigue signal; the synaptic strengthening by
 the organism's dopamine and the assembly's replay. Each scale grants its constituents the
 conditions they cannot grant themselves — an aggregate they cannot see, a window they cannot open —
 and grants it by signal, never by reaching in. The hierarchy is real, the circulation is closed,
 and at no point does it produce a seer of the whole or a commander of the parts.
 **This cross-scale circulation enters each component's ring at a definite phase.** Causation
 *circulates* across scales (this category); a component's ring *turns* across phases (category IX) —
 two different loops. They meet at a definite point: the downward constraint arrives at the
 component's PREPARATION phase, whose subject is precisely "what is handed down from above," and the
 upward emergence departs as what the component emits during ACTION and commits during EVALUATION,
 which sums into the aggregate the scale above will read. So the vertical arm of the cross-scale
 circulation is lived, inside each component, as the vertical phase of its ring. The three subjects
 of the ring (beside / self / above) are the three ways a component connects to everything else, and
 each of the other categories' flows plugs into the phase whose subject matches it.
 ---
 ## VII. Selection and Asymmetry
 **Building is the active drive; weakening is its shadow.** All the machinery is oriented toward
 strengthening what is significant and sustaining what is fuel-limited. There is no symmetric
 machinery for weakening. Weakening happens to whatever the building machinery did not select, as a
 consequence of the resources building consumed. The orientation is toward learning; forgetting is
 its cost.
 **Depression is never explicit — it is what happens when building does not.** No signal says
 "weaken this." Ceilings of both kinds decay continuously and are held up only by maintenance; when
 building consumes the shared resource, unmaintained ceilings drift down. Depression is the absence
 of maintenance, not the presence of a depression signal — and the same is true of lost endurance,
 idle capacity removed for lack of use, and of occupancy, which drifts back the moment its driving
 trace decays. In ring terms (category IX), this decay lives in the PREPARATION phase: weakening is
 what preparation's settling does to whatever evaluation did not supply enough to maintain. There is
 no weakening phase because weakening is un-honored decay inside the preparing phase.
 **Validation enters from beyond the part; the part cannot validate itself.** A component cannot
 know whether its own activity was significant — that information exists only at a larger scale and
 arrives as a signal (the neuromodulatory broadcast for the organism's verdict, replay for the
 assembly's). Cheap reversible change is autonomous; expensive lasting change requires authorization
 that enters from outside the component being changed. This is why lasting change always records a
 coincidence across scales: each scale confirms what the one below cannot know about itself.
 **Strength is associative; endurance is homeostatic.** Strength requires significance — the
 dopamine coincidence saying "this was worth saving." Endurance requires only that fuel, not
 structure or significance, was the binding constraint on a forming success — it needs no external
 validation, because metabolic sustainability is not the organism's to judge but the component's own
 to register. Two independent criteria, and selection requires winning on both: activity without
 significance is not saved; significance without sustainable fuel cannot be maintained. The
 conjunction filters for connections both valuable and viable.
 **Equilibrium is the residual of imperfection.** Where alignment or balance is reached, the success
 removes the very signal that drove it, allowing slow drift back, which regenerates the signal. The
 soma that aligns to its input rhythm stops generating the mismatch that aligned it, drifts, and
 re-aligns. The component that builds enough endurance stops depleting, loses the signal, and lets
 capacity decay until depletion returns. Each component hovers near its own optimum, never resting
 there, corrected continuously by the small errors its own imperfect state produces. What we
 describe as a stable population is the sum of these local never-quite-settlings.
 ---
 ## VIII. Coupling, Openness, and Boundedness
 **Couplings create trajectories, not just states.** Some variables, once moved, make further
 movement the same way easier — the astrosynapse wrapping tighter after potentiation, easing future
 potentiation. These self-reinforcing couplings give momentum: components do not merely occupy
 states, they follow trajectories, deepening whatever direction they have begun. The astrosynapse is
 the strongest such coupling — the gain control that reshapes the input itself, amplifying whatever
 trajectory a synapse is on.
 **The same signal serves opposite functions through different receivers.** Glutamate spillover
 brakes the presynapse while exciting the astrosynapse — one ligand, two receptor types, opposite
 cascades, simultaneous opposite effects. Function is set by the receiver, not the signal. One event
 coordinates several responses with no coordinating mechanism.
 **Metabolic availability is a selective pressure parallel to validation.** Beyond the explicit
 activity-and-reward gating, the bare availability of fuel continuously selects which components can
 participate: one that cannot be fueled cannot generate the activity that would let it be tagged.
 Metabolism silently shapes what can be learned, independent of and parallel to the plasticity
 machinery.
 **Finite and open, not infinite and closed.** The components are bounded and their state space is
 bounded, and they receive inputs they cannot generate from within — sensory drive, neuromodulatory
 and replay validation, metabolic supply. Because they are finite, their self-modification generates
 no infinite regress. Because they are open, their highest validation comes from outside any
 component being changed.
 **The fixed points are explicit, not hidden.** The quantities the components cannot modify from
 within — thresholds, the vascular ceiling, the neuromodulatory and replay signals — are declared as
 given. They are the boundary with what the components did not set and cannot inspect. Making them
 explicit is the honest acknowledgment that every self-modifying process operates within constraints
 it did not choose. Correctness is never certified internally: whether a change was good is answered
 by the organism's later experience in the world, fed back as signal. The fixed point lies outside —
 the components act, the world responds, and the response, not any internal check, determines what
 was worth keeping.
 ---
 ## IX. The Three-Phase Ring, and Its Two Turnings
 This is the integrator. Everything above describes *what* flows — resource, evidence, constraint,
 signals, capacity. This category describes *when*: the single cycle each local component turns,
 and how the earlier categories' flows distribute across its phases. One ring, run locally by every
 component, turned in two directions — outward by DAY, inward by NIGHT.
 **The ring has three phases, given by the three relationships a component stands in.** A component
 relates to exactly three things — its peers beside it, itself, and what is above it — and the ring
 is one turn through all three:
 - **ACTION** (subject: peers, *lateral*). The defining interaction with the component's
  counterparties. It is punctate — an event — and it deposits a fast trace, the residue the rest of
  the turn will read.
 - **EVALUATION** (subject: self, *local*, handing to the other scope). In the quiet after the
  action, the component reads the fast trace and works it up the ladder into slower evidence. It
  never acts; its product is an inert token minted for the *other* scope.
 - **PREPARATION** (subject: what is above, *vertical*, readying the next action in this scope). As
  the trace decays, the component settles its pools and gates forward, reads what has descended, and
  assembles the readiness the next action will run on. Preparation is the sole gateway to action.
 The order around the ring is ACTION → EVALUATION → PREPARATION → ACTION. Because it is a ring, no
 phase is first; each turn's preparation feeds the next turn's action, and each turn's evaluation
 reads the action that preceded it. A phase is a *role*, not a fixed physical event: the same
 physical machinery (a release, a structural change) can serve as different phases in different
 scopes, and each scope enters the ring at a different phase — the rotation is worked out in "The
 two turnings" below.
 **The ring is necessary; its co-location in one component is not.** What the logic guarantees is
 that the ring *closes* — that every action is evaluated and every action is prepared for — not that
 any single component runs all three phases itself. A component necessarily has ACTION: the local
 act it performs is what makes it a component at all. But the EVALUATION and PREPARATION of that act
 may live in *other* components. Take the calcium channel as a component: its ACTION is letting Ca²⁺
 in — that is its whole local act. It does not evaluate whether the influx mattered (the presynapse
 does, reading the resulting trace) nor prepare its own next opening (its coupling readiness is set
 by presynaptic short-term potentiation, and above that by neuronal provisioning). The channel is
 almost pure action; its evaluation and preparation sit in the components around and above it. Yet
 the ring is intact — the influx is acted, evaluated, and prepared for — merely spread across three
 components rather than turned within one. So the ring is a property of *coupled components*, not of
 the individual: a component contributes its action, its neighbors and superiors contribute the
 evaluation and preparation that action requires, and together they close a ring none of them runs
 alone. This is the same frame as category I — there is no ring-bearing "self," only local
 components whose coupled actions we describe as one closing ring.
 **Action is always local; evaluation and preparation may be local or contextual.** This is the
 axis beneath the previous point. A phase is *local* when the acting component supplies it itself,
 *contextual* when a surrounding or higher component supplies it. Evaluation and preparation come in
 both forms: the presynapse evaluates its own release and prepares its own next release (local),
 while the calcium channel's influx is evaluated by the presynapse and prepared by neuronal
 provisioning (contextual). Action admits no such split — it is always local, and necessarily so.
 A component can hold an aggregate and evaluate a neighbor's trace on its behalf, or provision a
 neighbor's readiness; but it cannot *act on a neighbor's behalf*, because the action simply is the
 local event occurring in that component. To perform another's action would mean it was never that
 component's action to begin with. Acting-for-another is not action but signalling. So the one phase
 that can never be contextual is action, and this falls directly out of what action is — which is
 why every component necessarily has its own action, while its evaluation and preparation may be
 scattered into its context.
 **The phases are event-delimited and decay-timed, never clocked.** A phase has no fixed duration.
 The action is the boundary where preparation ends and behaving begins; the fast trace's decay below
 threshold is roughly where evaluation ends and preparation resumes. The quiet interval between
 actions — a component's refractory-like period, whether literal refractoriness at the soma or the
 NOT-active steps at the bouton — is where evaluation and preparation live, and its length is set by
 the firing pattern. A fast train compresses preparation to nothing (no time to refill: depression);
 sparse action gives preparation its full extent. Timing here is chemistry, not a timer (category V).
 **Evaluation and preparation share the fast trace but send it two ways.** The same trace the action
 deposits is read by both: evaluation reads it for *significance* (climbing toward the tag, for the
 other scope), preparation reads it for *readiness* (tuning the next action's timing and thresholds,
 in this scope). The soma makes this visible — its nuclear-calcium climbs toward the tag
 (evaluation), while its inactivation, adaptation, and alignment traces tune the next spike
 (preparation) — all from the one spike's deposit. Evaluation looks up and across scopes; preparation
 looks around the ring to the next action.
 **Evaluation reaches the next action only through preparation.** Evaluation never acts; it lays down
 inert evidence. For that evidence to shape a future action it must pass through preparation, on one
 of two timescales. Within a scope: evaluation's medium products (possible-tag, endurance-need)
 become preparation's inputs, folded into near-term readiness. Across scopes: evaluation's slow
 product (the tag) waits, is consolidated into structure, and structure is read by the next scope's
 preparation. Either way — evaluation proposes, preparation disposes, action runs. The one-way ring
 is what separates gathering from acting by exactly the time it takes preparation (or the night) to
 honor what evaluation proposed; that separation is where deliberation lives.
 **The coincidences of the action sort by timescale.** Where a component detects the coincidences
 that authorize a lasting change depends on whether they must be instantaneous. Coincidences that
 must be simultaneous are detected *in ACTION* by the receptors themselves — the postsynaptic NMDA
 gate passing large calcium only when presynaptic glutamate, astrocytic co-agonist, and local
 depolarization align, amplified by the descended back-propagating spike. Coincidences that can be
 integrated over the quiet are detected *in EVALUATION* by trace accumulation — the organism's
 dopamine gating the tag over the following interval. Same logic (require several partners to align),
 sorted into the phase whose timescale it fits: instantaneous coincidence is action, integrable
 coincidence is evaluation.
 ### The two turnings
 One ring, turned in two directions. The three phases and their subjects are invariant across DAY
 and NIGHT; what rotates is the *content* flowing through them (information by day, resource by
 night) and — the sharp point — *which physical event counts as which phase*. From a component's
 own standpoint there is no "open" or "closed" scope: each turning runs against *its* environment,
 the world by day and the economy by night.
 **The same physical event is ACTION in one scope and EVALUATION in the other.** This is the
 deepest form of the duality. Transmitter release is the day's ACTION — the defining outward deed,
 transmitting to the world — and the fast trace is its byproduct, later evaluated. But the *same
 release*, run at night, is EVALUATION: the component releases not to transmit but as a *probe*, to
 read its own fast trace as a measure of how much it participates in the re-evoked pattern. And the
 structural change, which the day can only *mark* (the tag is an inert claim pointing at a
 restructuring that never happens by day), is the night's ACTION — its defining, irreversible deed.
 So the defining act of each scope is the assessment-instrument of the other: release is
 day-action / night-evaluation; restructuring is night-action / day-inert-mark. The scopes do not
 merely run the ring in two directions — they swap which event is the deed and which is the
 measurement. Because it is a ring, each scope simply enters at a different phase: the day enters at
 ACTION (act, then evaluate, then prepare — it must act first, the world will not wait); the night
 enters at PREPARATION (prepare, then measure, then act — it can afford to look before it leaps).
 **DAY — the ring turned outward.** PREPARATION reads the descended structure and refills the pools;
 ACTION is the cleft exchange (release, integrate, clear) against the world, leaving the fast trace;
 EVALUATION climbs the ladder to the tag — significance worked up, minted for the night. Currency:
 information, cheap, gathered passively. Ladder direction: evidence ascending. Token minted: the
 **tag**.
 **NIGHT — the ring turned inward, as a sequence of replay cycles.** PREPARATION imports material
 and energy and *primes* the component's own spontaneous threshold from its own standing tag (a high
 tag lowers the threshold, raising occupancy). ACTION is the structural change — general homeostatic
 lowering, then rebuilding where the tag still stands and participation was confirmed, consuming the
 tag on the build. EVALUATION is the probe: the component spontaneously releases/fires and reads its
 fast trace as *participation* in the re-evoked pattern — no dopamine, because significance is
 already settled; this measures only circuit centrality. Currency: resource, scarce. Ladder
 direction: capacity descending. Token minted: the **structure**.
 **Replay is how the undifferentiated tag is spent on specific behaviors — and it needs no
 orchestrator.** A component's tag accumulates by day from *many* behaviors into a single
 magnitude — how much change it needs, stripped of what for. It cannot spend that lump correctly in
 one commit (that would build a blend serving no behavior). Replay re-presents the day's behaviors
 one at a time so the lump can be allocated to each. The mechanism is local and emergent: at night,
 freed from external drive, components spontaneously fire; where a tag has lowered a component's
 threshold, intrinsic fluctuation ignites it, and the activation propagates through the *same
 pathways used by day*, re-evoking the pattern — but only where *every* link is primed (each
 component's own tag lowered its own threshold), so a pattern carries only if it was significant all
 the way around. This coherence is mechanical, not checked: an un-primed link breaks the loop at the
 gap. The re-evoked components run their *structural* logic, not their significance logic — they are
 not re-asking "did this matter" (settled) but "how much do I change for this." The replaying
 assembly is not an actor; it is the coincidence of many components' own lowered thresholds
 propagating through recurrent coupling — holism enacted, not encoded (category I).
 **Why night cycles: the tag depletes, and depletion re-sorts the queue.** Each re-evocation lets
 the participating components allocate a *slice* of their tag to that behavior and consume it — which
 raises their thresholds back, so that pattern steps aside and the *next*-deepest tag surfaces on the
 next cycle. The night sweeps its repertoire in rough order of tag depth, strongest most often, each
 pattern depleting and yielding to the next, exactly as a vesicle pool depletes and refills to
 schedule release one scale down. This is why the tag is spent incrementally across cycles rather
 than all at once, why strong memories replay repeatedly, and why consolidation is a gentle settling
 over many cycles (and many nights) rather than a single commit. The night ends when the tag is
 exhausted (well-rested — every significant pattern replayed and its structure rebuilt) or the
 night's energy is spent (overloaded — unspent tags carry forward). A pattern that never re-evokes
 before its tag decays is simply never built — which is how the turning forgets.
 **The two turnings are stitched by evaluation, and the fatigue loop switches between them.** Each
 scope's EVALUATION mints the token the *other* scope will consume: day-evaluation mints the tag
 that night spends; night-evaluation (participation) gates the structure that the next day operates
 within. This *payload* handoff is distinct from the *switch* — the fatigue loop (category II) that
 decides *when* a component crosses between scopes. One says what crosses; the other says when to
 cross; they are orthogonal (category II). So the DAY/NIGHT alternation is one ring, entered at two
 different phases, handing off to itself through evaluation, switched by fatigue — not two separate
 machines.