Suspected Banksy artwork appears on the side of a house, depicting government agents spying on a phone box near GCHQ (Government Communications Headquarters) in Gloucestershire, England, Sunday. Jules Annan/Barcroft Media/Landov hide caption

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Banksy's "Sirens of the Lambs" started its tour of New York City in — naturally — the Meatpacking District. BanksyNY/Youtube hide caption

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An image from a video posted by Banksy shows a man representing the artist staffing a sidewalk stall featuring signed works for $60. Banksy says he only made $420 Saturday, with one customer negotiating a 2-for-1 discount. Banksy NY/YouTube hide caption

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A man inspects a plastic cover placed over Slave Labour, an artwork attributed to Banksy, in London. This piece of art was put up for sale in Miami last February, but the ensuing outrage led to the auction's cancellation. The mural is now part of an exhibition in London, and is is expected to move to the U.S. afterward. Peter Macdiarmid/Getty Images hide caption

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A man inspects a plastic cover placed over an artwork attributed to Banksy in London. The stencilled image depicts a poor child making Union Jack flags on a sewing machine and is located on the wall of a Poundland discount shop in the Wood Green area of north London. Peter Macdiarmid/Getty Images hide caption

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A man inspects a plastic cover placed over an artwork attributed to Banksy in London, England. The stencilled image depicts a poor child making Union Jack flags on a sewing machine and is located on the wall of a Poundland discount shop in the Wood Green area of north London. Peter Macdiarmid/Getty Images hide caption

itoggle caption Peter Macdiarmid/Getty Images