Banksy's rigged art frame was supposed to shred the whole thing

Banksy's artworld shocker performance piece, earlier this month, when a canvas of his went under the hammer at Sothebys in London, suggests not. Immediately the Girl with Balloon canvas sold -- for a cool ~$1.1M (£860,000) -- it proceeded to self-destruct, via a shredder built into the frame, leaving a roomful of designer glasses paired with a lot of shock and awe, before facial muscles twisted afresh as new calculations kicked in. As we reported at the time, the anonymous artist had spent years planning this particular prank.