On Food and Cooking: The Science and Lore of the Kitchen, by Harold McGee.
To a great game designer there is no useless knowledge.
So You Want To Be A Game Designer
This is not a book on game design. Nor is it a book on any skill you are likely apply to game design. It is, however, a book that has elicited more excited conversation from my fellow game designers than text on graphics or storytelling. It is a book about cooking, but it is not a cook-book. Rather it is a compendium of “science and lore”, a place where the art and craft of the kitchen meet with the science of the laboratory. It short, it is the cooking for geeks.