3D Street Paintings
I think Mr Reyes showed some pictures like this to us not long ago. These are some really cool pictures I found while searching google images. They are done by a man ( I dont know his name unfortunatly) with chalk I think, on the streets pavement. They look so 3D and as if you can just dive into them. I particualry like the optical illusion 2, called summer time. http://www.sudokuz.eu/illusion/illusionen.php is the website, there are a few pics on there, not all on pavement either.