Science & Society Picture Library/Contributor/SSPL/Getty Images: 21, 54, 89, 127
Time Life Pictures/Contributor/The LIFE Picture Collection/Getty Images: 23
Biblioteca Nacional de España/Códices Madrid de la BNE: 25, 56
Alinari Archives/Contributor/Hulton Archive/Getty Images: 29
Universal Images Group/Contributor/Universal Images Group/Getty Images: 34, 48
Massimo Merlini/Getty Images: 36
DEA PICTURE LIBRARY/Contributor/De Agostini/Getty Images: 37, 46, 49, 65, 66, 77, 125
De Agostini/W. Buss/De Agostini Picture Library/Getty Images: 39
Trattati di architettura ingegneria e arte militare/Beinecke MS 491/Beinecke Rare
Book & Manuscript Library/Yale University Library: 40, 42
Biblioteca Ariostea, Ferrara: 43
Universal History Archive/Contributor/Universal Images Group/Getty Images: 44, 50, 64, 91
DEA/VENERANDA BIBLIOTECA AMBROSIANA/Da Vinci Codex Atlanticus/
Getty Images: 52, 55, 59, 86
Dennis Hallinan/Alamy Stock Photo: 53, 88
DEA/A. DAGLI ORTI/Contributor/ De Agostini/Getty Images: 57
DEA/VENERANDA BIBLIOTECA AMBROSIANA/Contributor/De Agostini/Getty Images: 58
GraphicaArtis/Contributor/Hulton Archive/Getty Images: 60, 61
Mondadori Portfolio/Getty Images: 63, 71, 74
Buyenlarge/Contributor/ Archive Photos/Getty Images: 67
Leonardo da Vinci/Private Collection/Getty Images: 70
Ted Spiegel/Contributor/Corbis Historical/Getty Images: 76
Heritage Images/Contributor/Hulton Archive/Getty Images: 80, 122
Thekla Clark/Contributor/Corbis Historical/Getty Images: 81
Fine Art/Contributor/Corbis Historical/Getty Images: 83, 94, 141
Sachit Chainani/EyeEm/Getty Images: 84
Apic/Contributor/Hulton Archive/Getty Images: 102, 114
GraphicaArtis/Contributor/Archive Photos/Getty Images: 104, 115
De Agostini Picture Library/Contributor/De Agostini/Getty Images: 105
Seth Joel/Contributor/Corbis Historical/Getty Images: 117
DEA/G. CIGOLINI/VENERANDA BIBLIOTECA AMBROSIANA/Contributor/De Agostini/Getty Images: 119
Godong/Contributor/Universal Images Group/Getty Images: 120
DEA/A. DAGLI ORTI/Contributor/De Agostini/Getty Images: 124
DEA/J. E. BULLOZ/Contributor/De Agostini/Getty Images: 128
Christophel Fine Art/Contributor/Universal Images Group/Getty Images: 129
Print Collector/Contributor/Hulton Archive/Getty Images: 133
Universal Images Group/Contributor/Universal Images Group/Getty Images: 134, 142
AFP/Stringer/AFP/Getty Images: 135
DEA/C. SAPPA/Contributor/De Agostini/Getty Images: 138
Xavier ROSSI/Contributor/Gamma-Rapho/Getty Images: 139
Alinari Archives/Contributor/Alinari/Getty Images: 143