Paul Schatz (1898, Konstanz - 1979) was a German-born sculptor, inventor and mathematician who patented the oloid, discovered the inversions of the platonic solids including the "invertible cube" which is often sold as an eponymous puzzle, the Schatz cube. From 1927 to his death he lived in Switzerland.
- Biography of Schatz from Schatz foundation website
- Paul Schatz models (in German)
- Hans Dirnböck, Hellmuth Stachel: The Development of the Oloid
- About Kaleidocycles, including mention of Schatz cube
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