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I recently saw or read somewhere of a group of geometrical bodies that share a special property with the sphere: no matter how you rotate them, they have the same "thickness" in all directions. They had a specific name. Does anyone know what I'm referring to?

Thanks!

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    https://en.wikipedia.org/wiki/Curve_of_constant_width2012-05-11
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    Or maybe better: http://en.wikipedia.org/wiki/Surface_of_constant_width. Or just type "constant width" into Google; many links appear.2012-05-11

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