Ribbons v1 — Invisible walls rainbow
The clamped-spiral ribbon re-inked: spectral colour cycles along the band as it flattens against the frame's hidden walls.
The same broad band coils against the same unseen bounds, flattening into straight runs where the spiral is clamped at the frame's margin — but the ink now cycles through the spectrum along the strip, teal folding into red and back.
Structurally this is the purple variant with the colour hard-coding removed: the stroke is fed by a swappable palette module, spectral by default, and the backdrop's rounded-ring count no longer breathes. Everything else — the clamped spiral, the rotating point stamps, the brightness cycle that fakes the satin twist — carries over unchanged.
