Thursday, May 20, 2010

Optical illusion

This amazing little video was produced by pointing a camera at a real-world scene composed of four tracks that guide the movements of rolling marbles:

As soon as the table is turned around, providing you with a view of the scene from the opposite side, you can immediately see the tricks behind the illusion. The tracks simply slope downward towards their intersection, and they're designed in such a way that, when viewed from a certain angle, they seem to slope upward. The creator of this excellent illusion is Koukichi Sugihara of the Meiji Institute for the Advanced Study of Mathematical Sciences, Japan.

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