The Times' David Koon reviews British graffiti phenom Banksy's documentary "Exit Through the Gift Shop," about the career trajectory of his quasi-protege, Thierry Guetta. The movie, Koon writes, provokes these questions: "
What is art? Why do we want it? What determines which art sells for millions and which ends up on the curb? The answers to those questions, as the film proves, often have absolutely nothing to do with creativity and talent."