"This book is an opus of world-famous origamist Robert J. Lang that presents the mathematical and design principles he uses to create original origami. The techniques are accompanied by folding instructions that illustrate them, building up to very advanced models at the end of the book. The second edition includes three new/highly revised chapters on box pleating, uniaxial box pleating, and polygon packing as well as smaller revisions throughout and improved illustrations"-- Provided by publisher.