Hans/Jean Arp 

Jean Arp / Hans Arp (September 16, 1886 – June 7, 1966) was a German-French
sculptor, painter, poet and abstract artist in other media such as torn and pasted paper.

Arp was a founding member of the Dada movement in Zürich in 1916. In 1920, as Hans Arp, along with Max Ernst, and the social activist Alfred Grünwald, he set up the Cologne Dada group. However, in 1925 his work also appeared in the first exhibition of the surrealist group at the Galerie Pierre in Paris.

I visited the Arp Museum last saturday: www.ipernity.com/doc/16071/1918418