Everybody knows the image, but nobody knows its story. In 1490, Leonardo da Vinci produced his iconic drawing of a man inscribed in a circle and a square: Vitruvian Man. Today the image appears on everything from coffee cups and T-shirts to corporate logos and spacecraft, and has become the world’s most famous cultural icon. Yet few people know anything about it. In this remarkable book, Toby Lester, the author of the award-winning Fourth Part of the World, tells the picture’s story, weaving together a saga of people and ideas that sheds surprising new light on the life and work of Leonardo, one of history’s most fascinating figures.