Jean, or Hans, Arp was born in Strasbourg. He moved to Switzerland in 1915 where he co-founded the Zurich dada group. During this period and in the 1920s he made wooden reliefs, collages and drawings. He was interested in the effects of chance and also in nature and organic forms. Arp met his future wife Sophie Taeuber in 1922, and they produced many collaborative works. Arp joined the surrealist group in 1925 after the dada movement disbanded. He began making free-standing sculpture in the early 1930s, after previously making only sculptural reliefs.