I found the work of Julian Beever when I received a chain email with a few of his images. I immediately looked him up to learn more. The bottle in the photo above was drawn with chalk on a two-dimensional surface (the sidewalk). INSANE. I wonder what he does before starting to draw -- does he really have such an uncanny mastery of perspective, that he can achieve such a convincing 3-D effect without prior sketches and computer-aided stretching?
Check out more of his stuff here.