Neon signs seen through fog, where the halo belongs to the air and not the lamp — so a distant sign is dimmer AND wider, and the fog carries the colour of whatever is lit in it.
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.