By Matthew Bramlett Staff Writer One of the most well-known and sought-after street artists may not even exist. Mr. Brainwash, the eccentric filmmaker turned artist whose real name is Thierry Guetta, has seen his image and personal brand explode in recent years. It began in 2008 with his debut art show “Life is Beautiful,” and continueswith his starring turn in graffiti artist Banksy's documentary on the growing street art phenomenon, Exit Through the Gift Shop. Since Banksy's film opened last year, Mr. Brainwash (or, rather, the idea of Mr. Brainwash,) has been the subject of much speculation. All across the Internet, there have been different sources claiming that not only … [Read more...] about Purposeful portrait or preposterous prank?