Inside front and back covers illustration by Keetra Dean Dixon
27, 51 Ladislav Sutnar © Ladislav Sutnar, reprinted with the permission of the Ladislav Sutnar Family.
49, 53 Sol LeWitt “Doing Wall Drawings” © Estate of Sol LeWitt/Artists Rights Society (ARS), New York. Courtesy Paula Cooper Gallery, New York.
50 Max Bill © 2015 Artists Rights Society (ARS), New York / SIAE, Rome.
67, 91 Muriel Cooper, reprinted courtesy of Nicholas Negroponte.
94 P. Scott Makela, reprinted courtesy of Laurie Haycock Makela.