The book starts off with the basics, and explains how to read origami diagrams. Lang sticks to what is more or less the standard symbols used in lots of origami books, so this introductory course is a good place to start. A few simple models follow, and then the bar is raised gradually, up to the insanely complex cuckoo clock. Excellent! If you're a "neo-hardcore-strictly-square-paper-origami-enthusiast" you might have some issues with Lang's choice of paper sizes used on some of the models. I tend to prefer using squares myself, but Lang's less orthodox paper size models are a lot fun, and often intriguingly challenging. A good book, but probably best for people who've some experience with paper folding already. The "Complete" in the title is slightly misguiding, as the book does not contain the classic cranes or other simple, classical models. But then so many other books do, and this book contains quite a few other great models.