And then he took squares and triangles and curves and cones and rhomboids and tetrahedrons and a great many other things that were in space; and he worked very fast and furiously, and presently he had made a machine which ground with a deafening roar, for it was a high-speed, self-acting, creating machine, the like of which had never been.
"The Book of Gud"
Dan Spain Harold Hersey
Almost touching them with their bases were an equal number of pyramids, of tetrahedrons, as sharply angled and of similar length.
"The Metal Monster"
A. Merritt
They separated, lining up on each side of the leader now standing a little in advance of the twin tetrahedrons, rigid and motionless as watching guards.
"The Metal Monster"
A. Merritt