For his 1970 solo exhibition at the Whitney Museum of American Art, Robert Morris: Recent Works, Robert Morris created process pieces-"spills" of concrete, timber, and steel-which filled the entire third floor of the museum (Fig. 1). These constructions, including a ninety-six-foot-long installation that spanned the length of the room, were the largest pieces the Whitney had ever exhibited (Fig. 2). Assembled over the space often days, the installations were built with the help of a team of more than thirty forklift drivers, crane operators, and building engineers, as well as a small army of professional art fabricators (Fig. 3).' An article in Tme magazine observed, "as workmen moved in …