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The warp algorithm, re-implemented for the browser. Drag the sliders or roll a seed; the address bar keeps every setting, so a link reproduces exactly what you are looking at.

This is an independent implementation of the same method: value noise, stacked into fractal noise, then sampled through an offset of itself. It uses its own random source, so a seed here will not match the same seed in the renderer — for exact reproduction, use render.py. It runs at a lower resolution than the published pieces so it stays interactive.