this is what i love, public art that makes a statement. he's altering our world and the way we see it, but he's doing it simply by cleaning off the dirt that is already there. it brings up a lot of interesting questions. people have tried to make the argument that what he is doing isn't actual graffiti and that it shouldn't be illegal, ect. i'm all for street art but this particular process is just as permanent as any spray paint would be. his art will be there until someone cleans the wall in its entirety. 

ps. watching this video makes my inner germaphobe scream, but its still very cool none the less.