Pablo Picasso once called painting “a sum of destructions.” Banksy, the anonymous British graffiti artist and popular provocateur, admitted he had Picasso in mind when he pulled off the most memorable art-world prank in years. As millions of people now know, Banksy’s “Girl With Balloon,” a 2006 spray painting on canvas, self-destructed a few moments after the hammer came down on it at a Sotheby’s contemporary art auction in London on Friday. The auction was held in Frieze Week, when collectors from around the world descend on central London for the Frieze art fair. “Girl With Bal
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