A women takes a picture of an artwork of British street artist Banksy in Berlin, Germany, Tuesday, Sept. 13, 2011. The graffiti showing five soldiers with angel's wings and yellow smiley faces beneath the slogan "Every picture tells a lie!" is now on show again at the Kuenstlerhaus Bethanien gallery. Originally sprayed by the artist in 2003 during a street art project at the gallery, the Banksy had disappeared beneath several layers of paint by subsequent art shows. (AP Photo/Michael Sohn)
BRISTOL, ENGLAND - AUGUST 19: People pass sections of what is set to become the UK's largest street art project on August 19, 2011 in Bristol, England. The See No Evil art project on Nelson Street in Bristol will see several multi story buildings in the street covered with art over the coming days. Organisers hope that the project, which has involved top graffiti artists from all over the world, will become a major tourist attraction for the west country city, often said to the spiritual home of Banksy. (Photo by Matt Cardy/Getty Images)
BRISTOL, ENGLAND - AUGUST 19: A graffiti artist works on what is set to be the UK's largest street art project on August 19, 2011 in Bristol, England. The See No Evil art project on Nelson Street in Bristol will see several multi story buildings in the street covered with art over the coming days. Organisers hope that the project, which has involved top graffiti artists from all over the world, will become a major tourist attraction for the west country city, often said to the spiritual home of Banksy. (Photo by Matt Cardy/Getty Images)
BRISTOL, ENGLAND - AUGUST 19: A graffiti artist works on what is set to be the UK's largest street art project on August 19, 2011 in Bristol, England. The See No Evil art project on Nelson Street in Bristol will see several multi story buildings in the street covered with art over the coming days. Organisers hope that the project, which has involved top graffiti artists from all over the world, will become a major tourist attraction for the west country city, often said to the spiritual home of Banksy. (Photo by Matt Cardy/Getty Images)
BRISTOL, ENGLAND - AUGUST 19: A graffiti artist works on what is set to be the UK's largest street art project on August 19, 2011 in Bristol, England. The See No Evil art project on Nelson Street in Bristol will see several multi story buildings in the street covered with art over the coming days. Organisers hope that the project, which has involved top graffiti artists from all over the world, will become a major tourist attraction for the west country city, often said to the spiritual home of Banksy. (Photo by Matt Cardy/Getty Images)
BRISTOL, ENGLAND - AUGUST 19: (EDITORS NOTE: A TILT SHIFT LENS WAS USED TO CREATE THIS IMAGE) An artwork on display, part of what is set to become the UK's largest street art project, on August 19, 2011 in Bristol, England. The 'See No Evil' art project on Nelson Street in Bristol will see several multi story buildings in the street covered with art over the coming days. Organisers hope that the project, which has involved top graffiti artists from all over the world, will become a major tourist attraction for the west country city, often said to the spiritual home of Banksy. (Photo by Matt Cardy/Getty Images)
BRISTOL, ENGLAND - AUGUST 17: Graffitti artists begin working on what is set to be the UK's largest street art project on August 17, 2011 in Bristol, England. The See No Evil art project on Nelson Street in Bristol will see several multi story buildings in the street covered with art over the coming days (Photo by Matt Cardy/Getty Images)
An artist from Thailand sprays graffiti at "The Rendezvous" South East Asia Urban Art Event in Yangon February 4, 2012. 28 artists from Myanmar, Thailand, Indonesia, Malaysia, Vietnam and Phillipine showcased their Graffiti art at the art show. REUTERS/Soe Zeya Tun (MYANMAR - Tags: SOCIETY)
In this Monday, Jan. 23, 2012 photo, Egyptian women walk past graffiti depicting a military tank on a wall under a bridge in Cairo, Egypt. In May, Mohamed Fahmy, known in the graffiti world as Gazneer, made one of Cairo's largest and longest surviving pieces of street art under a bridge used by taxi drivers to urinate. It was an image of a military tank pointed toward a boy on a bike who, rather than carrying a traditional bread delivery, was carrying the city on his head. It was a symbolic reference to youth who care for the nation and are heading toward a collision with Egypt's military rulers. On his blog, Ganzeer wrote: "Our only hope right now is to destroy the military council using the weapon of art." (AP Photo/Nariman El-Mofty)
A pedestrian passes graffiti art on a wall in north London, September 24, 2009. British media have attributed the new work to Banksy. (REUTERS/Toby Melville)
Graffiti art is seen on a wall, in Camden in London, December 22, 2009. British media have attributed the new work to Banksy. (REUTERS/Luke MacGregor)
Graffiti art is seen on a wall next to the Regent's Canal, in Camden in London, December 22, 2009. British media have attributed the new work to Banksy. (REUTERS/Luke MacGregor)
FILE- In this Thursday, June 30, 2011 file photo, Philipe Almeida takes a picture of a graffiti covered wall during a two-hour graffiti tour given by Roam Rides in the Wynwood neighborhood of Miami. In addition to Art Basel Miami Beach, Miami visitors can also tour the graffiti-clad streets in Wynwood on a Vespa. (AP Photo/Wilfredo Lee, FILE)
An Egyptian man passes a mural and graffiti in Arabic that reads "where is freedom and social justice?" in Cairo, Egypt Thursday, Feb. 9, 2012. Egypt is refusing to back down in a dispute with the U.S. over Cairo's crackdown on nonprofit groups despite Washington's threats to cut aid, while the military deployed troops to the nation's streets after a surge in violence and protests against its rule. (AP Photo/Nasser Nasser)
A man paints graffiti of people who died during clashes between protesters and security forces over the last year, on a wall near Tahrir square in Cairo February 8, 2012. REUTERS/Mohammed Salem (EGYPT - Tags: POLITICS CIVIL UNREST)
