simulation

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Harmonograph

http://local.wasp.uwa.edu.au/~pbourke/surfaces_curves/harmonograph/
http://oolong.co.uk/Trochor.htm The pattern traced out by Trochor is what you’d get if you took a pencil moving in ellipses, and used it to draw on a sheet of paper that’s also moving in ellipses. It’s a bit like a spirograph , but not constrained in quite the same ways. It’s more like a harmonograph; more on that later.

Animated Virtual Harmonograph

http://www.balldroppings.com/

BallDroppings

BallDroppings is an addicting and noisy play-toy. It can also be seen as an emergence game. Alternatively this software can be taken seriously as an audio-visual performance instrument.