In the '50s, he became friends with another innovative alliterative artist, Robert Rauschenberg
[DOC] [TLE] Robert Rauschenberg  SERAPHIN GALLERY [PAR] Nov 26, 2010 ... Robert Rauschenberg Seraphin Gallery Contemporary Art Gallery ... 
Rauschenberg is well known for his "Combines" of the 1950s, in which non-
traditional materials and objects were employed in innovative combinations.