'See No Evil' street art project (detail) is displayed at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)

'See No Evil' street art project (detail) is displayed at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)

People walk past part of the 'See No Evil' street art project at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)

'See No Evil' street art project (detail) is displayed at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)

'See No Evil' street art project (detail) is displayed at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)

'See No Evil' street art project (detail) is displayed at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)

An artist continues to work on part of the 'See No Evil' street art project at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)

A man walks in front of part of the 'See No Evil' street art project at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)

A artist continues to work on part of the 'See No Evil' street art project at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)

A man photographs part of the 'See No Evil' street art project at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)

'See No Evil' street art project (detail) is displayed at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)

People walk in front of part of the 'See No Evil' street art project at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)

An artist continues to work on part of the 'See No Evil' street art project at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)

Artists continue to work on part of the 'See No Evil' street art project at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)

Parts of the 'See No Evil' street art project is displayed at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)

Parts of the 'See No Evil' street art project is displayed at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)

'See No Evil' street art project (detail) is displayed at Nelson Street on August 17, 2012 in Bristol, England. The project, now in its second year, is Europe's biggest street art festival and has attracted top graffiti artists from all over the world. Organizers hope it will continue to be a draw for tourists visiting Bristol, often seen the spiritual home of underground artist Banksy. (Photo by Matt Cardy/Getty Images)