Al Seckel's book Masters Of Deception: Escher, Dali & the Artists of Optical Illusion showcases the "visual trickery" employed by twenty artists well-known for their innovative use of optical illusion and perspective. This in itself sounds very cool, but what's even cooler is the website he created to accompany the book:

There are a number of incredible artistic works featured in Masters of Deception, which require movement to appreciate their full impact. Additionally, I had in my possession various interviews with some of the book's featured artists that I wanted to share with my readership. Unfortunately, the publisher was unwilling to produce a CD to accompany the book. I have created this web site, therefore, to augment and enhance the reader's experience by presenting those works and interviews that I could not present in book form.

The website has dozens of QuickTime videos available for viewing that show that artists at work as well as highlight some important works of art. Definitely check it out...