Having in this book the diagrams (as always clear and easy to follow) of some of the most famous Lang's models (the Black Forest Cuckoo Clock, the Bull Moose, the Koi, amongs the others) is not the best reason to give it five stars.
First of all this book tell the definitive (for now) word on origami design.
The explanation of the circle pack theory applied to origami and the examples can be read and understood by every one (the mathematical chapter needs an appropriate skill though, but it's not indispensable to the comprehension of the others parts of the book).
Amazing the look you can have on the birth of some of Lang's models too.
