Here we see a collection of ten physics simulations in which balls are released to bounce around. The astonishing part is the point in the middle of each sequence where the balls arrange themselves in a pattern. That can’t really happen, can it? It’s really nice to see anyway, and if you want to know how it’s done, click on the spoiler quote.
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There’s a bit more about the physics and programming involved at the YouTube page. -via Kottke
Source: neatorama