Jean (Hans) Arp was a French-German artist and poet known as a founding member of Dadaism. His abstract collages, paintings, and sculptures of organic forms were motivated by an interest in harnessing unconscious thought and parodying established ideas. “A painting or sculpture not modeled on any real object is every bit as concrete and sensuous as a leaf or a stone,” he once remarked. “But it is an incomplete art which privileges the intellect to the detriment of the senses.” Born Hans Peter Wilhelm Arp on September 16, 1886 in Strasbourg, Germany (present-day France), his mother was French and his father German—thus he used the first name Jean in French-speaking countries and Hans in German-speaking countries...