Ellen Brooks, Untitled (beam), 1991. Courtesy of the artist.

Andres Serrano, Piss and Blood VII, 1987. Courtesy of the artist.

Uta Barth, Untitled #15, 1991-93. Courtesy of the artist.

Thomas Ruff, Constellation, 1989. Courtesy of the artist.

L: Penelope Umbrico, Untitled (digits), 1991-94. R: James Welling, Beacon, c. 1980.