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A hard drive containing unfinished works by Terry Pratchett has been crushed by a steamroller, as per instructions left by the fantasy novelist. Pratchett did not want people to see his work in progress - yet many an unfinished symphony, novel or artwork is sought out and treasured for itself - despite its incomplete nature. John Mullan, a professor of English at University College London, told Radio 4's PM why an unfinished piece of art or literature is something to be appreciated. (Photo: An open book with blank pages. Credit: Getty Images)
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