Orthogonal Projection of a Solid of Constant Width

This Demonstration illustrates Minkowski's theorem: the orthogonal projection of a solid of constant width is a figure of constant width. The solid is a Meissner tetrahedron (consisting of 13 parts); it is projected ontoa plane through the origin with normal .

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Reference
[1] M. Gardner, The Unexpected Hanging and Other Mathematical Diversions, New York: Simon and Schuster, 1969 p. 219.
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