Figure 1.

Figure 2.

Frank Lloyd Wright, Guggenheim Museum, New York. Wiki-media Creative Commons (gomattolson)

Figure 3.

Frank Gehry, Guggenheim Bilbao. Wikimedia Creative Commons (Zarateman)

Figure 4.

Louis Kahn, Phillips Exeter Academy Library, Exeter, New Hampshire. Wikimedia Creative Commons (Gunnar Klack)

Figure 5.

Michelozzo di Bartolomeo, Palazzo Medici Riccardi, Floren-ce. Photo by Harry Mallgrave

Figure 6.

Leon Battista Alberti, Palazzo Ruccelai, Florence. Photo by Harry Mallgrave