Kitaoka peripheral drift: rings of tiles in a black-dark-white-light sequence appear to rotate steadily although nothing moves. The four-tone order is the whole effect, and on a transient it reverses and every ring turns the other way.
Drawn with: a WebGL2 shader.
Reacts to and looks like: gpu, webgl2 and psychedelic.
Family: Visualiser.
Runs in your browser. The preview above is the same program the renderer uses.