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Object of Constant Width - Tetrahedron

Object of Constant Width - Tetrahedron

thingiverse

This is a shape which, like a ball, always has the same width all the way around. Though it appears to be a strange shape, you could run a board over it as smooth as marbles. Here's a gif of these things in action: https://i.imgur.com/YpW7Cej.gifv Inspired by the book "How Round is Your Circle" by John Bryant & Chris Sangwin.

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