Symmetric Spheroform Tetrahedron

by tmackay May 15, 2019
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Depends on what you call smooth. The centre of mass moves up and down as it rolls so it will have a bit of a wobble and gravitate towards standing pointy end up but if you have a bunch of them between two flat surfaces, the surfaces will remain parallel - you wouldn't know they were there unless they were heavy enough to cause accelerations as the mass moves up and down.

nice matematic intersection 4 circles