This sphere-shaped cast metal brainteaser puzzle represents a planet and its surrounding ring. Positioned snugly inside the ring, the planet looks as if it cannot be removed. It may appear that all you can do is rotate it on its axis, but is that really th
This sphere-shaped cast metal brainteaser puzzle represents a planet and its surrounding ring. Positioned snugly inside the ring, the planet looks as if it cannot be removed. It may appear that all you can do is rotate it on its axis, but is that really the case? By Oskar van Deventer.
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