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Over the course of three days, from February 14 to 16, 2007, Mel Bochner and his assistant Nicholas Knight installed Theory of Boundaries at the National Gallery of Art in the East Building, Concourse Gallery 29F. The work, whose size is determined by the length of the wall on which it is installed, consists of four squares of equal size, each separated by a space equal to one-third of the width of a single square. Dry pigment is applied directly to the wall, with each square following the principles determined by its "language fraction" (hence the work's title, Theory of Boundaries); thus, each square represents a different relationship between colored surface, border, and state of enclosure.