graffito: n. A drawing or inscription made on a wall or other surface, usually so as to be seen by the public.
Personally, I think graffiti artists are kind of like the Picassos of hip-hop culture. They portray a language, an image, a voice and a vision. & well, the individuality of a free expression is just displayed through its thirst for art. What a better canvas than a stone wall.
Barry McGee aka "Twister"; street rat to professional gallery artist.