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Sylpheed/docs/re/f6-what-the-human-is-watching.md
sylph-decoder aaac060510 re+handoff: correct F6's separation -- it was measured against ptcopyright
The F6 page measured the sweep-to-plate separation against ptcopyright and
called it the plate. I had already established, on another page, that
ptcopyright is NOT the plate -- ptbtn00f is. Against the real plate the lead
is 83 and 165 frames, i.e. 0.138 and 0.141 of a sweep loop (2.2% apart),
against the 0.057 I published and sent to the port.

The conclusion is unchanged and stronger: with no input the glow precedes
the plate by 2.4x more than reported, and with A it still collapses to
essentially zero (-1 frame). Gating the sweep on the plate is a worse fit
than I made it sound.

Third instance of a label being the error rather than the measurement, and
this one is the same label I had already corrected elsewhere -- the
correction did not propagate to a page written after it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jc4pciRArGHfxGGhEbwp5t
2026-09-03 20:24:00 +00:00

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F6 — the human is watching their own Ⓐ press, not either declared event

Question: why does a person see the glow start exactly when the plate appears, when the declared data starts it far earlier?

What the human looks at: boot, and press Ⓐ early — the glow and the PRESS Ⓐ plate come up together. Then boot again and press nothing: the glow arrives clearly first, well before the plate.

What this does NOT cover: the 238…250 exit ramp (already settled as an exit), and anything about the menu.

Instrument: ⟨capture⟩ ×4 — two no-input controls, two with a press.

The brief asked which of two declared events this is. It is neither.

🔴 Numbers corrected 2026-09-02. This page first measured the separation against ptcopyright, calling it "the plate". It is not — the plate is ptbtn00f, the pulsing element, identified in f6-plate-identity-and-clock-conflict-resolved.md. Measured against the real plate the lead is 2.4× larger. The conclusion is unchanged and stronger; the figures below are the corrected ones.

sweep enters ptbtn00f (plate) separation (vs ptcopyright)
f6b no input f577 f660 83 frames 34
f6 no input f746 f911 165 frames 67
f5-early Ⓐ during build-in f438 f437 1 frame 2

Phase-free, as a fraction of the sweep's own 600-unit loop: the controls give 83/600 = 0.138 and 165/1168 = 0.141 — agreeing to 2.2 % across runs that differ 2× in frames — against ~0.002 when Ⓐ lands early.

Ⓐ collapses the gap by a factor of ~80. It reveals the plate and restarts both sweep leaves at their own t=0 in the same frame (f5-verified-with-full-quad-reader.md), so the two events become simultaneous because the player caused both.

Why the report and the data both stand

The human presses Ⓐ to get through the boot — that is what a player does — and at that instant the plate appears and the glow restarts together. Their observation is accurate. It is a description of a boot with a press in it, not of the declared timeline.

The last row is the check that makes this an explanation rather than a story: in f5 the press landed after the sweep had already started on its own, and the two are 29 frames apart. Same input, opposite result, decided only by when the press falls.

🔴 What the port must not do

Do not start the sweep when the plate appears. That reproduces one boot and breaks the other: with no input the glow genuinely precedes the plate by 0.14 of a sweep loop. The correct behaviour is both of the pieces already delivered —

  • the declared parent gate, α0 until t=70, full at t=100; and
  • Ⓐ restarting both leaves at t=0 as it advances the shared clock.

Together those produce the human's observation and the no-input one, with nothing authored.

Refutation attempt

I tried to find a case where the port's current behaviour (declared gate + snap restarting leaves) fails against these captures, and could not. All four runs are consistent with it. Recorded as an attempt that did not land.

Not settled

  • The per-cycle phase fit for the post-wrap decomposition.
  • Wrap-to-wrap sweep period: still one wrap per capture.