The artist as blind spot Banksy occluded in "Exit Through the Gift Shop"

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Reviews of the new film "Exit Through the Gift Shop" often invoke Duchamp as the patron saint of the deadpan artistic fake-out. While it would be simplistic to dismiss the Fountain as what the British would call a "piss take," there is something Duchampian in the play between simulacrum and authenticity that's apparently at stake here.