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The hexasphericon is a curious mathematical object that has only two edges and one outer surface. When it rolls across a plane, every point on the outer surface will make contact. In order to do that, it takes a strange, whimsical path! This Hexasphericon has been hollowed out with the edges removed, giving it a sleek look while greatly decreasing the volume. That means you can get a larger sphericon at a lower cost! This one is roughly 2" across. A great physics toy ~~~