The book's table of contents lists at least eight different projects. The excerpt pages I saw on Amazon.com suggest that the book uses lots of clear photographs to show how to make each project. The projects use easy-to-find materials and tools such as rubber bands, cardboard, pencils, push-pins, white glue, and scissors.
Sounds like some cheap, easy, DIY, mechanical toy fun to me.
Check out the book Amazing Rubber Band Cars: Easy-to-Build Wind-Up Racers, Models, and Toys