Adapt

stare at the dot. then trust nothing.

six silkscreen plates your eyes finish: stare at a picture in opposite colours and its grey copy comes up in full colour; watch a spiral turn and the still print turns back, for as long as you hold

Stare at one colour and the cones in your eye that catch it turn their sensitivity down. When the plate turns to grey ink, those tired cones answer the grey less than the rest do, so it leans toward the opposite of what you stared at. The stare plates are printed in each colour's opposite, at the same lightness as the grey copy, so the grey leans back to the picture's true colours, inside its own edges. It needs the eye held on the dot, and it fades in seconds as the cones recover. The spiral works further in: cells in your brain that sense motion one way turn their gain down while you watch it turn, so when it stops the cells for the other way win for a while and the still print seems to turn back. A longer watch usually makes that last longer, up to a point; your two times are measured by your own finger.

Concepts: perception, vision.

An interactive you play with one thumb, on Wundr.