Paint running down glass, where the trails are real: each frame moves the last one down the flow and adds fresh pigment at the top. Thicker paint runs faster, so a flat curtain breaks into fingers on its own.
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.