Figure 2-2, Photograph by Maria Kaloudi

Figure 3-1, Photograph by Liam Abrahamsen

Figure 4-1, Photograph by Jimmy Wewer

Figure 8-1, Courtesy NASA/JPL-CalTech

Figure 9-1, © Tate, London 2007

Figure 10-2, W1950-3-1, Rubens, Peter Paul; Prometheus Bound; Philadelphia Museum of Art: Purchased with the W/P. Wilstach Collection, 1950

Figure 10-3, AP/WIDE WORLD PHOTOS