Last Wednesday the anonymous British graffiti artist known as ‘Banksy’ sold a few prints at an auction in Paris. This is notable mainly because of what didn’t happen: the last time Banksy art was sold (earlier this month) it self-destructed only moments after the gavel went down on a bid of over a million British pounds. Banksy had installed a shredder inside the frame, which was remotely activated as soon as the sale was complete. It sounds a bit like the stuff of spy movies, and certainly was a first for the art world. Or was it?