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Rubik's Cube

What fascinates me most about the rubik's cube, is the internal mechanism that enables the twisting of the eight 3 x 3 faces in any direction. In fact, Erno Rubik's challenge in the mid-1970's was that one. Only later he realised that he could make a puzzle out of it.
See Also: http://en.wikipedia.org/wiki/Rubik%27s_Cube

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