Sidewalk chalk-drawings: Incredibly realistic 3D

Aunt Janice, bless her heart, sent along some images from Julian Beever, a famous sidewalk artist. I was particularly stunned by his anamorphic images which present an absolutely terrific 3D illusion (the two shown here are used without permission, hope he doesn't mind but I'll remove 'em if he does).

Notice in the first one that you can see the join marks between the pavement blocks through the image; while the tones aren't photorealistic, the illusion of depth is outstanding. He's got a bunch more on the site, go look!