Duchamp by Ray, 1923

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Next Friday, an auction of rare photographs in the Paris Sotheby's includes a treat for Marcel Duchamp fans: an original portrait of the artist by lifelong collaborator Man Ray, consigned by the Duchamp family itself. The item, bearing Ray's original Parisian stamp, is expected to fetch bids in the 15,000- to 20,000-euro range (roughly $21,000 to $28,000).