Jean Tinguely (1925 - 1991) Sculptor and also a pioneer in the field of art that engenders social engagement. His sculptures often rely on the spectator to push a button, pull a lever, or somehow cause them to start moving.
Jean Tinguely untitled
Proletkunst No. 4 by Tinguely.
Tinguely Jean : Single work : Caro Giovanni
Jean Tinguely 1979 Letter Drawings
Fontaine de Tinguely
Jean Tinguely, Incitation à la Création, 1981 http://vickydavid.com/artist-jean-tinguely.htm