Kaleidocycles: Seventeen Models of Escher's Graphics and the Story of How They Were Devised - Tapa blanda

Combining interesting explanations with 3-dimensional models to cut out and glue together, this book is an exploration of the symmetries of Escher's plane tilings. Some designs fold to make polyhedra and there is the delight in how the motifs fit together at the vertices and along the edges. Others make into kaleidocycles, models of linked tetrahedra which will turn thru their centers. As they are rotated Escher's interlocking patterns form and reform in endless procession. It is said that 'everyone loves surprizes' and this book is full of them