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That shape must be patented or copyright protected, because all the Amazon listings are several hundred dollars each. The usual knockoffs are conspicuous in the

That shape must be patented or copyright protected, because all the Amazon listings are several hundred dollars each. The usual knockoffs are conspicuous in their absence.

planede 3y ago
AFAIK the required precision for it to work is quite high.
- rlpb 3y ago
  Indeed. The Wikipedia article says: "The gömböc, as the first physical example, is less sensitive; yet it has a shape tolerance of 10−3, that is 0.1 mm for a 10 cm size."