Hoberman medium sphere
An expanding/contracting ball. In geometry, an icosidodecahedron is a polyhedron with twenty triangular faces and twelve pentagonal faces.
An icosidodecahedron has 30 identical vertices, with two triangles and two pentagons meeting at each, and 60 identical edges, each separating a triangle from a pentagon.
As such it is one of the Archimedean solids and more particularly, a quasiregular polyhedron.
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