Rain Splatter

a painting that makes itself. rain lands on a floor drawn in perspective, and every landing throws specks that bead or skid depending on how fast they arrive.

key insight: two canvases, and that split is the whole design. one is cleared every frame and holds what is moving, the other is never cleared and holds what has landed. a mark costs one draw and then nothing, which is what lets the piece accumulate thousands on one clear.

the fade is spent in whole steps, since a canvas holds 8 bits a channel and an erase under 1/255 rounds to nothing and silently stops fading. destination-out rather than a wash of the ground colour, so the layer stays transparent.