The Art of Game Design - Book Lenses

The author of Thinker Toys has gone right out of my brain, but this was a book recommended to me by the designer of color switch. The one I'm digging into now is a thinker toys. And it seems to have a lot of great advice about just how to break down problems and move forward on them. Are there other books, you know, top two or three that come to mind of things that you would recommend for aspiring game designers? They don't have to be game design books, just things that you think are valuable.