In October 1942, the great French conceptualist artist Marcel Duchamp helped put on the first major surrealist exhibition in New York. Louise Hidalgo has been speaking to Carroll Janis, whose parents were friends of Duchamp, about the exhibition, the man and his art, including Duchamp's famous urinal.Picture: A replica of Marcel Duchamp's iconic work, Fountain, at the opening of an exhibition in London in 2010. Duchamp first exhibited Fountain in 1917 (Credit: Geoff Caddick)