"Picture in your mind´s eye a sand box devided in half with black sand on one side and white sand on the other. We take a child and have her run hundreds of times clockwise in the box until the sand gets mixed and begins to turn gray; after that we have her run anti-clockwise, but the result will not be a restoration of the original divison but a greater degree of grayness and an increase of entrophy."

Robert Smithson, The Writings of Robert Smithson, N.Y.University Press, 1979.