Figs. 1-2
Christo and Jeanne-Claude, The Umbrellas (The Great New York City)

An American Vista

Fig. 5
Albert Bierstadt, The Rocky Mountains, Lander's Peak

A Modern Earthwork

Fig. 8
Robert Smithson Spiral Jetty, Great Salt Lake, Utah

The World As We Perceive It

Fig. 12
Childe Hassam, Allies Day, May 1917

Fig. 13
Jasper Johns, Three Flags

The Psychological Process of Seeing