Robert Smithson's earthwork, Spiral Jetty, located at Rozel Point, Utah, on the shores of the Great Salt Lake. Photographed in 2004 by Netherzone. Source: Wikimedia Commons
Diego Velázquez. Las Meninas, 1656. Source: Las Meninas on Wikimedia commons
Martha Rosler. Semiotics of the Kitchen, 1975. Further details available on the Museum of Modern Art website.
Detail of Las Meninas. Self-portrait of the artist Diego Velázquez Source: Detail on Wikimedia Commons