After working in the area of Combinatorial Optimization, Dr. Savage did an about face, and entered the field of Combinatorial Obfuscation. Inspired by the tessellation patterns of M.C. Escher, he developed the SHMUZZLE(tm) Puzzle in 1979.
A standard jigsaw puzzle is comprised of pieces of MANY DIFFERENT SHAPES, that fit together ONLY ONE WAY. The SHMUZZLEtm Puzzle is comprised of pieces of ONLY ONE SHAPE that fit together MANY DIFFERENT WAYS (168 factorial to be exact).
On the back of each piece is an Escherian salamander known as a SHMUZZLE
These can engage in various acts of Shmuzzling as shown below.