Arp visited New York City in 1949 for a solo exhibition at the Buchholz Gallery. In 1950 he was invited to execute a relief for the Harvard University Graduate Center in Cambridge, Massachusetts and would also be commissioned to do a mural at the UNESCO building in Paris. Arthur and Madeleine Lewja, of Galerie Chalette, who had known Arp in Europe, became his gallery representatives in New York in the late 1950s, and were instrumental in establishing his reputation on the American side of the Atlantic.