LONDON, ENGLAND - FEBRUARY 18: A visitor stands in front of a painting entitled 'Masterpiece,' during a press preview of 'Lichtenstein, a Retrospective' at the Tate Modern on February 18, 2013 in London, England. The painting is part of a retrospective exhibition by 1960's Pop Artist Roy Lichtenstein, the first of its kind in 20 years, which runs at the gallery until May 27, 2013. (Photo by Dan Kitwood/Getty Images)
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