Robert Rauschenberg, Untitled, 1955

Robert Rauschenberg (1925 – 2008) was associated with his friend Jasper John in New York in the early 1960s in the creation of Pop Art. His works include paintings, collages, and combinations of disparate objects – ‘Monogram’, 1959, consists of a stuffed goat girdled by a tyre on a painted base.

Taken from Dictionary of Art and Artists, by Peter and Linda Murray, 1959
Combine Painting – Enciclopedia Treccani.