A checkerboard floor sagging under its own weight, each tile pinned at its corners and drooping by its own band energy. The sag pulls the pattern with it and darkens what has dropped, so the shape and the shading can never disagree.
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.