British graffiti artist Banksy has exhibited works in the Brooklyn Museum, the American Museum of Natural History, the newly opened MOMA and the Metropolitan Museum of Art, all without ever being invited or asking permission. He has never had a show, nor sold any of his pieces. His biggest critics it seems are the police, who Banksy persistently scorches as the subject matter in his street graffiti . Sneaking into the museums with a pre-framed piece of his art smuggled in his jacket, Banksy hangs his pieces alongside master works and quietly slips out , leaving his art to reside undetected for sometimes multiple days. If you haven't seen his work yet, slide over [here] for peaceful insurgency in action.