The Instrument and the Substrate

I. The Substrate Doctrine

Every page of this archive is complete before a single GPU program compiles. Typography, palette strips, friction gauges, and the frosted telemetry rail are set in CSS — the substrate — and the substrate is never a placeholder. This inverts the habit of the shader-demo tradition, in which the canvas is the page and its loss is a blank rectangle. Here the loss of an instrument is designed to be imperceptible: the plate beneath it was always finished.

The doctrine has a mechanical corollary: instruments must be permitted to die. The optical engine carries a one-way degradation ladder — a lost WebGL context, a failed compile, or a sustained frame cost past twenty milliseconds each retire the instrument for the session and return the surface to its static state, permanently and without ceremony. No retry loops, no spinners. An instrument that cannot fail invisibly was never an instrument; it was a hostage.

Gating is therefore not a performance apology but the curatorial position. A museum does not run its centrifuge in the reading room. It keeps the reading room quiet and brings a visitor to the bench when the visitor asks to see the experiment run.

☞

An instrument that cannot fail invisibly was never an instrument; it was a hostage.

II. Parameters With Provenance

What separates an optical instrument from a lens flare is where its numbers come from. Every sovereign entry in the Design Atlas now carries a numeric optics block — scattering depth, micro-facet roughness, specular anisotropy, metalness, refractive index at the sodium D line, and a patina accumulation rate — authored against published material constants: calcite marble near n = 1.56, Bohemian lead crystal at 1.66, silk fibroin at 1.54. When the Carrara plate glows at its limb and the urushi plate does not, the difference is a row in the archive, not a mood in the art direction.

The pigment bath obeys the same rule. Mixing coefficients are not invented; they are inverted from each pigment's catalogued masstone through the Kubelka–Munk relation K/S = (1 − R)² / 2R, the two-constant scattering model that has anchored industrial color practice since 1931 and computer-generated watercolor since Curtis and colleagues demonstrated it in 1997. Gold stirred into Klein blue turns the compromised green of a real palette because the mathematics of turbid media says it must.

This is the archive's structural advantage over any component library: the parameters were already here. The same row that voices a nation's earcon frequency and its palette's APCA scores now drives its plate's subsurface glow. Provenance is not a caption on the shader — it is the shader's input.

III. One Context, Many Windows

Browsers cap live WebGL contexts near a dozen and evict the eldest without appeal, which is why a page of independent canvas widgets is a page that eventually crashes itself. The Chromologium runs one context on a detached canvas. Each instrument registers a rectangle; the engine renders visible rectangles into scissored viewports and blits each region into that surface's own two-dimensional canvas within the same frame.

The blit is not a compromise — it is what preserves the site's compositing model. Backdrop filters, blend modes, and scroll-linked reveals continue to layer exactly as the substrate intends, because every instrument remains an ordinary DOM node rather than a hole punched through the stacking order by a full-viewport underlay.

The loop itself is parsimonious: it runs only while an instrument intersects the viewport, suspends when the tab hides, halves its backing resolution under frame-budget pressure, and disarms entirely on constrained hardware. The reader pays for optics precisely while looking at optics.

IV. Restoration as the Default State

The preference spine resolves in strict order: the operating system's reduced-motion contract outranks the site's own switch, which outranks the device heuristics. A visitor who has asked their machine for stillness receives the full archive, still. This ordering is printed into the engine rather than the style guide, because an accessibility promise enforced by convention is a promise already half-broken.

The chrono-degradation scrubber follows the same ethic in miniature. It ages iron-gall fades, cellulose foxing, and craquelure into the reproduction plate — never into the living document. The text of a monograph is not a specimen; it is the reading room. Only the framed plate on its wall may be weathered, and the scrubber's rightmost stop is not decay but restoration.

This, finally, is the thesis the archive publishes to its machine feeds without embarrassment: CSS is the substrate; GPU passes are opt-in instruments on declared surfaces, sharing one context, dying quietly, and citing their coefficients. The claim survives contact with the source code — which is the only kind of claim an archive should make.