Going behind the scenes with 24 of Los Angeles's most prolific graffiti artists -- including Mear, E-Muse and Man-One -- Bob Bryan's award-winning documentary reveals the underground world of the urban art from. Candid interviews and open discussions with the artists provide insight into the link between graffiti, ritualistic hieroglyphics and cave paintings, as well as how graffiti functions as a form of street propaganda and public art gallery.