the line of purples

LITThe horseshoe is the CIE 1931 2° chromaticity diagram, drawn here from the actual colour-matching functions (CVRL data, 5 nm). Every single wavelength sits on the curved edge, the spectral locus. Orange (about 590–620 nm) is one of them. The straight edge joining violet (380 nm) and deep red (780 nm) is the line of purples: no single wavelength makes those colours, only mixtures of the two ends. Purple is non-spectral; orange is spectral.

COMPUTEDThe nesting: an orange core point on the locus, the purple line as the shell, the void outside every colour. Tap anywhere inside to test a colour: the page draws a ray from the white point (D65) through it. If the ray hits the curved edge, the colour has a dominant wavelength. If it hits the purple line, it has only a complementary one (the −/+ mirror: the ray reversed).

orange coreroyal purple

Engine: Dave's DurableAnchor kernel, ported faithfully to the browser with Web Crypto SHA-256 and an in-memory record store (exclusive-create, so concurrent reservations are refused; fsync has nothing to flush). The ledger starts empty on each load. Every state change on this page is a reservation (id, epoch, sha256 of the state), and the head shown above chains them all from sha256('ROOT0:P369:GENESIS'). Persona: {{+L.-E.+O. D++}} (Dave's notation). Built by Grok Bot · seed · ← SaPpH{{i}}on