Leonardo da Vinci’s “Codex on the Flight of Birds” is displayed at the “Leonardo da Vinci y la idea de la belleza” (Leonardo and the idea of beauty) exhibit at the Palacio de Bellas Artes in Mexico City on Wednesday, June 24, 2015. The Exhibition will be open from June 26 to August 23. The Codex shows some of Leonardo’s studies about aerodynamics and taxonomy. (AP Photo/Berenice Bautista)

Walter Isaacson is the author of Leonardo da Vinci and the president and CEO of the Aspen Institute. His biography of Leonardo Da Vinci reveals a man obsessed with knowledge and who is almost impossible to know. “Leonardo da Vinci” is printed on 80 stock paper with high-definition illustrations.