M. C. Escher Kaleidocycles

Corte Madera, CA: Pomegranate Artbooks. Very Good. 1987. Revised Edition. Paperback. 0876542089 . This book is in Very Goodc ondition and was issued without a dust jacket. The book and its contents are in generally clean, bright condition The folder cover has several bumps, rubbed spots and edge tears. The interior book is in Very Good condition and has some toning to the top edge of the front cover. The text pages are clean and bright. The Kaleidocycles are mostly clean, bright, and un cut. The very first Kaleidocycle has a couple of lines of the punch out lines punched, but not completely. "A kaleidocycle or flextangle is a flexible polyhedron connecting six tetrahedra (or disphenoids) on opposite edges into a cycle. If the faces of the disphenoids are equilateral triangles, it can be constructed from a stretched triangular tiling net with four triangles in one direction and an even number in the other direction. The kaleidocycle has degenerate pairs of coinciding edges in transition, which function as hinges. The kaleidocycle has an additional property that it can be continuously twisted around a ring axis, showing 4 sets of 6 triangular faces. The kaleidocycle is invariant under twists about its ring axis by k p / 2 [\displaystyle k\pi /2], where k k is an integer, and can therefore be continuously twisted. " (From Wikipedia) .