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A computer-generated portrait of a face that will mutate forever is among the works on display in London. "Memories of Passersby I" by German programmer Mario Klingemann is an eye-catcher. Consisting of two screens wired to a computer, the artwork generates a male-looking face on one side and a female-looking one on the other. It has an estimated price tag of 30,000-40,000 pounds. Lucian Freud's portrait "Head of a Boy" should fetch up to 6.5 million pounds.