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