Origami Design Secrets Second Edition Author:Robert J. Lang Written by the world-renowned origamist Robert J. Lang, this work presents the mathematical and design principles used to create original origami. Drawing on his own designs, the author illustrates the techniques with folding instructions. Highly advanced models are included at the end of the book. This second edition presents several new chapte... more »rs on polygon packing and box pleating as well as improved illustrations throughout.« less