Street art, on the other hand, usually has a political or social message and aims to encourage the viewer to think. Although like graffiti, street art is usually illegal, many consider it an alternative art form, valuable to the community at large. "Street art will only hit certain areas - rich areas-- next to museums or galleries where people with money will see and notice it. They don't go to tunnels, or the side of a highway. They won't risk getting caught," said BG 183.