Cool fake-motion optical illusions with a piece of clear plastic with black lines on it (I believe), that even fooled the cat.
It’s a neat video, and a simple trick in principle, though I’d still be curious to know how they did the underlying drawing. Phil Plait at Slate does a good job walking you through how the illusion works.
There are two videos below, check them out, very cool.
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Here’s a second video: