In the mid-1950s, declaring "there is no reason not to consider the world as a gigantic painting," Robert Rauschenberg began a series of radical experiments with what he called "Combines," a term he coined to describe works that fused cast-off items like quilts or rubber tires with traditional supports. "Canyon" (1959), one of the artist's best-known Combines , is a large canvas affixed with paper, fabric, metal, personal photographs, wood, mirrors...