This cube is tangible proof of Banach-Tarski paradox which says, roughly, it is possible, in a space 3 or more dimensions, taking a ball and divide it into a finite number of separate pieces that can be placed so as to obtain two identical models of the original ball.
It can buy MoMA (Museum of Modern Art in New York) for the "modest" sum of $ 60.
But hey, why pay when you can build one yourself?
Otherwise you can always settle for a simplified version that will undoubtedly occupy your children. You will not find, however, the dodecahedron, but that's another good reason to enjoy the beautiful weather we have and go get outside!
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