The palette was generated once and pushed to every layer of every section for
the whole runtime. Five minutes, one scheme, no movement — and colour is the
strongest perceptual variable the system has, so freezing it wasted the
biggest lever available for making a long video feel like it is going
somewhere.
Deliberately not "a new palette per section". A track has one identity and
the palette is most of it; replacing it mid-video reads as a different video.
What moves is the palette ITSELF — rotated, warmed, opened up — so at four
minutes the image is somewhere the first minute implied. Four modes: static
(one in six or so, a held colour is a legitimate choice), drift (slow hue
travel across the whole track), sections (each kind gets its own offset, so
the colour tells you where you are), and lift (saturation and lightness
rising into a drop).
Movement happens in OKLCH, which needed the inverse of the existing
conversion: rotating hue in RGB changes brightness as a side effect, and that
artefact is the reason this project picked OKLCH in the first place. The
rotation is applied to every colour equally, so the scheme and the spread
that made the palette a palette survive the move.
Bounded on purpose at ±34° hue, ±35% saturation, ±0.07 lightness. A full
rotation would destroy the identity as surely as a new palette; the movement
has to be the kind you notice on a rewatch, not the kind you notice as an
effect.
Four new Phase 11 checks, two of which are the counter-checks that keep this
honest. Colour must actually move (weakest 0.232 channel distance across 18
moving tracks) AND must stay inside its identity. The contrast floor is
asserted at 1620 sampled points across the movement rather than at the two
ends, because a saturation lift can flatten a perfectly good palette
somewhere in the middle. The moved palette is memoised on a rounded shift,
and a fourth check proves a seeked frame gets bit-identical colours to a
played one rather than merely similar — that would have been an export-only
determinism fault.
47/48 on phases 7-11 slow; the one failure is the known load-dependent
Horizon Lines flake already recorded in d14d473. All determinism and
preview/export-agreement checks pass.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
