The sense organs emerge from measured γ on the same R19 switch

Each sense organ emerges from its master gene's measured stacking stiffness γ — eye from PAX6 (γ=1.511), ear from PAX2, olfactory from LHX2, skin from TP63 — read by the same R19 switch. STATE decides presence, the spinodal orders the organs, and DWELL ∝ γ^1.5 sets relative size. Order and presence are forced; size and time open.

The organs that begin the loop are not assumed; they emerge from real, read-only γ values (corr(γ,GC)=0.993 in the source catalog), the same primitive that writes genes and fires neurons. With the master cis on each organ is present and with it off the organ is absent even when its partner genes are intact; as a global morphogen drive ramps, the organs cross their discontinuous threshold |h_sp| in a fixed γ-set sequence (skin → ear → muscle → eye → olfactory → cerebellum), and DWELL ∝ γ^1.5 ranks their relative size. A present organ then hosts its transducer (§10) and an absent organ transduces nothing. The developmental order and the relative-size order are forced [F] and verified [V]; absolute size and absolute timing are calibration and open [O].

One switch, organ and neuron alike

The organ and the neuron are the same R19 switch read at two scales. The neuron's switch fires a spike; the organ's master switch decides whether the organ forms, on the master gene's measured γ — the stacking stiffness read off real promoter sequence, never fitted. The eye's master PAX6 has γ=1.511, the ear's PAX2 has γ=1.464, the olfactory master LHX2 has γ=1.517; these are the same read-only values the DNA paper uses, so the chain is continuous from gene to organ to spike.

Presence is STATE, not γ

An organ is present only if its master cis drive clears the γ-set threshold, regardless of how complete its parts are. In the run every organ is present when the master is on and absent when it is off, even with the partner genes intact — parts present is not the trait, exactly the lesson the snake limb makes concrete in the DNA paper. γ sets where the threshold sits; STATE decides which side of it the organ is on.

The developmental order is the fourth dimension

As a global morphogen drive ramps over time, the organs switch on in a fixed γ-set sequence, and that sequence is the fourth dimension on top of the organ's three-dimensional form. The functional spinodal — the drive needed to flip each master — orders them skin (|h_sp|=0.613) → ear → muscle → eye → olfactory → cerebellum (0.738); sweeping the drive from below all thresholds to above them brings the organs on one by one, none to all six, monotonically. The order follows from measured γ alone and is forced; the absolute developmental time is calibration and open.

Relative size from DWELL

How long each master switch runs sets the organ's relative size through DWELL ∝ γ^1.5. Ranked by DWELL the organs read cerebellum > olfactory > eye > muscle > ear > skin, an ordering fixed by the measured γ values. The ranking is forced [F]; the absolute size of any organ needs separate data and is open [O].

From organ to receptor

A present organ hosts the transducer that feeds the loop, and an absent organ feeds nothing. The emerged eye carries the photoreceptor that converts 565 nm light to 23 spikes, the ear its mechanoreceptor, the olfactory epithelium its chemoreceptor, the skin its thermoreceptor (§10); when the master is off and the organ is absent, the same stimulus yields zero spikes because there is no organ to transduce it. Emergence and transduction are one chain: the gene builds the organ, the organ reads the world.

What this locks, and what stays open

This chapter locks the developmental order and the relative-size order across the sensory and motor organs as Layer-1 facts forced by measured γ, verified in a deterministic module. What stays open is Layer-2: the absolute size of each organ, the absolute developmental time, and the on/off STATE timing all need separate data and are marked [O] in the ledger, never asserted as evidence. The organs now emerge with a forced order; their absolute dimensions wait for calibration.