In addition to describing the hopeful, nature-inspired design principles that are making industry both prosperous and sustainable, the book itself is a physical symbol of the changes to come. It is printed on a synthetic "paper," made from plastic resins and inorganic fillers, designed to look and feel like top quality paper while also being waterproof and rugged. And the book can be easily recycled in localities with systems to collect polypropylene, like that in yogurt containers. This "treeless" book points the way toward the day when synthetic books, like many other products, can be used, recycled, and used again without losing any material quality—in cradle-to-cradle cycles.