The LEGO Power Functions Idea Books show off small projects to build with LEGO’s system of gears, motors, gadgets and other moving elements. Both books are filled with hundreds of buildable, clever mechanisms that demonstrate a key technique or mechanical principle. You'll get: The LEGO Power Functions Idea Book, Vol. 1: Machines and Mechanisms The LEGO Power Functions Idea Book, Vol. 2: Cars and Contraptions
