Sarah Thornton, an art expert and contributor for The Economist, said four previously unknown copies of Marcel Duchamp's "Fountain," a urinal submitted as a piece of art, have recently been confirmed as authentic copies of the same urinal, The Times of London reported Monday.
Thornton said one of urinals is in the possession of Arturo Schwarz, 86, a friend of Duchamp. Schwarz said he may attempt to sell the item for about $2.5 million.
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