Washes that dry darker at the rim because of the coffee-ring effect, with granulation into the paper tooth, ragged fronts pinned on fibres, and backruns blooming on transients.
Drawn with: a WebGL2 shader.
Reacts to and looks like: gpu, webgl2 and audio-reactive.
Family: Visualiser.
Runs in your browser. The preview above is the same program the renderer uses.