Awesome 3D drawings

My uncle sent us an email with pictures of pavement drawings done by the artist Julian Beever. He works in Europe mostly I think, doing chalk drawings on the sidewalk that look 3D when viewd from a certain angle. Cody was telling me about it before I looked and I couldn't imagine how that would appear or how it would be possible. Then I looked for myself and my jaw dropped with shock. I don't know HOW this guy is able to do this, it's very impressive and cool! Check it out (Look under anamorphic illusions.)