3-D Chalk Artists.

I recently found two awesome chalk artists, Kurt Wenner and Julian Beever on www.2leep.com, that create realistic 3-D drawings in public streets and sidewalks. From certain angles these chalk drawings look distorted and completely out of proportion but from the right angle they look almost realistic. I found these drawings to be really interesting because of the medium in use and how the artist creates 3-D images on a 2-D plane. What's interesting about the medium is that its not permanent and will eventually wash away. All that work can only be seen days after the initiall drawing in person or in a photograph. Julian Beever's work can be seen here: http://users.skynet.be/J.Beever/pave.htm