Julian Beever is an English artist who's famous for his art on the pavement of England, France, Germany, the United States, Australia and Belgium. Beever's paintings are anamorphous, images drawn completely from diforms (I have no idea what any of this means, but that's what I was told). This gives them a 3D image when viewing them on the correct angle. *grins* These are cool.

Looked at from the wrong angle:

And the right angle: