Jessen's icosahedron

Jessen's icosahedron, sometimes called Jessen's orthogonal icosahedron, is a non-convex polyhedron with the same number of vertices, edges and faces as the regular icosahedron. It is named for Børge Jessen who studied it in 1967, although the same shape had also been constructed earlier by Kenneth Snelson.

Jessen's icosahedron

Jessen's icosahedron, sometimes called Jessen's orthogonal icosahedron, is a non-convex polyhedron with the same number of vertices, edges and faces as the regular icosahedron. It is named for Børge Jessen who studied it in 1967, although the same shape had also been constructed earlier by Kenneth Snelson.