The Hands-On Marvelous Ball Book begins with a whimsical story about a boy and a ball and the discovery of geometry in the sphere through folding paper circles. There are specific folding projects with many possible directions to explore, giving the experience of folding and joining circles, exploring the sphere, polygons, symmetry, and a couple of transformational movement systems. This book functions as both a story book and introduction to folding circles for a wide range of ages., particularly for children that are still stimulated by stories and pictures that moves into hands-on activities. This is not so much about the information as it is the experience.
You can see more about this project on my blog or purchase the book online.