Robert Morris, Untitled (Corner Piece), 1964
From the Guggenheim:
Morris’s sculptures often consist of industrial or building materials such as steel, fiberglass, and plywood, and were commercially fabricated according to the artist’s specifications. The value of the “artist’s hand”—the unique gesture that defines an individual’s skill and style—was inimical to Morris, and the work of art became, in theory, not an “original” object but a representation of the idea from which it was conceived. This notion allowed for the creation and destruction of a piece when necessary; Untitled (Corner Piece), for example, can be refabricated each time it is to be exhibited.
Andy Goldsworthy, Feathers plucked from dead heron / cut with sharp stone / stripped down one side / about three-and-a-half feet overall length / made over three calm days / cold mornings / frost / smell from heron becoming pungent as each day warmed up, 1982