4776 · Contour

A watershed that draws — and sings — itself.

Droplets carve a seeded mountain in real time. You see it top-down as a contour map; its strongest channel — the spine — is sampled by altitude into a slow marimba loop that settles toward consonance as the drainage network matures. Drag on the map to rain there.

The map begins eroding the moment it loads — silent until you press Start (browser autoplay policy). Give it a few minutes: valleys deepen, contours pinch into V-shapes, and the river tree branches into a mature dendritic network.