A triacontahedron has 30 rhombic faces. Discovered by Johannes Kepler (the father of modern astro-geophysics), its vertices align with a compound of the dodecahedron and the icosahedron with relative edge lengths in the Golden Mean. It also represents the void in the the middle of the 5 cubes of the dodecahedron. It is also the outer shell of a 6D cube projection.