crystallography

 

"Fig. 102 shows a tetrahedron (o), it's edges bevelled by the trigonal tristetrahedron, +202/2, k{211} (l), and its angles replaced by the rhombic dodecahedron (d)."

From the 1890 edition of Elements of Crystallography by George Huntington Williams.  Fig. 102. appears in the chapter "The Isometric System".

operations

 

child of

doodletime

 

and then Roy Orbison and Devotchka joined in.