I've read this off an on over the months, and I am sure I will read it many more times - which I think is about the best recommendation I can give. It's my first Math Fact plus Fiction book I've ever read (or heard of), and it's definitely not for those of us not entranced by metaphysics and fractal gaskets. The book is written in an interesting way, from the perspective of a time traveler and his crystalline companion. I was a bit put off at first, but after the almost campy nature of the characters came through, I really had fun with it. Math geeks, I promise you will, too.