Works By Banksy Go Up For Auction At Bonhams

LONDON, ENGLAND - MARCH 23: A detail shows the reverse of Banksy's 'Girl and Balloon' which was painted on an Ikea frame on display at Bonhams auctioneers on March 23, 2012 in London, England. The painting, estimated at GBP 15,000 - 25,000, USD 24,000 - 40,000 and 18,000 - 29,000 euros, forms part of the Urban Art Sale, which takes place at Bonhams on March 29, 2012. (Photo by Peter Macdiarmid/Getty Images)