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This is a Flash animation of a double pendulum, an extremely simple system (there are only two points of freedom) that demonstrates deterministic chaos. MP4 BackUp
It's not hard to understand what's happening if you look at the whole picture (though you may still find the erratic behavior of the pendulum surprising). But if all you could see was the moving red dot, without the mechanism behind it, could you reconstruct the simple system driving its behavior?
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