Kepler's Rhombic Solids
Kepler discovered his rhombic solids as the convex hulls of compounds of a Platonic solid and its dual. The rhombic dodecahedron derives from the cube-octahedron compound; the triacontahedron derives from the dodecahedron-icosahedron compound; and the cube from the stella octangula. The nets of the compounds are also shown.
 P. R. Cromwell, Polyhedra, Cambridge: Cambridge University Press, 1997 pp. 152–153.