This polyhedron contains the twenty triangles and twelve pentagons of a rhombicosidodecahedron — but they are all smaller than those found in that solid. As a result, the thirty squares of the rhombicosidodecahedron have each become, instead, irregular octagons.

To try the software I use to generate these images, simply visit http://www.software3d.com/stella.php — where a free trial download is available.