Do you normally think of graffiti as subversive art spray-painted illegally on the walls of a city? A number of arttists, including Edgar Mueller, Julian Beever and Kurt Wenner, defy that stereotype, painting and chalking openly on city streets and sidewalks. Check out these brief bios with 20 amazing images of their work from around the world! This stuff is truly amazing. I'd love to see it in real life.