Reverse Graffiti

English street artist Paul Curtis (who goes by the name Moose) creates stunning images and murals by removing dirt and grime from walls.

I think reverse graffiti is an amazing way to create art because not only is it connected to eco-friendliness by being nondestructive and leaving no trace, it also inspires people to be cleaner themselves.

http://www.youtube.com/watch?v=5lX-2sP0JFw