Robert RauschenbergThe first comprehensive look at Rauschenbergs Cardboard series, a previously unexplored realm of the artists oeuvre Robert Rauschenberg (b. 1925) began to investigate the boundaries between painting and sculpture in the 1950s, working with a variety of found objects in his Combine paintings and freestanding Combines. Later, in his Cardboard series (197172), he confined himself to the use of cardboard boxes, eliminating virtually all imagery, reducing