Several years ago, when I was just starting undergrad, I ran across an instructional text on chalking beautiful mathematical diagrams while killing time in the college library. In my infinite wisdom, I decided that I should remember this book's name, and find it again whenever I had the time to go through it.

A few weeks back, I finally thought about it again, but this event apparently preceded my book list—I've forgotten everything except its existence.

Is anyone aware of anything that might be it? The only other things I remember are some very nice fold-out illustrations and that it was at the tail end of the QAs, close to the astronomy and physics collections.