Albert Einstein wrote that the mind “always has tried to form for itself a simple and synoptic image of the surrounding world.” During the Renaissance, when the ancient Greek idea of man as the measure of all things leapt to the forefront of intellectual life, the human body became a preferred object for this type of “synoptic” speculation. In a widely read treatise titled “Divina Proportione” (1509), the Italian mathematician Luca Pacioli echoed fashionable opinions of the day by declaring that our body measurements express “every ratio and proportion by which God reveals the innermost secrets of nature.” Pacioli’s close friend Leonardo da Vinci provided illustrations.

In the richly rewarding history “Da Vinci’s Ghost,” Toby ­Lester, a contributing editor at The Atlantic, shows that Leonardo had long been fascinated by the concept of man as a microcosm of the universe. Before the Pacioli collaboration, the idea had inspired what has since become one of Leonardo’s most famous images, “Vitruvian Man” (circa 1490), a careful line drawing of a nude male figure whose outstretched arms and legs fit perfectly in the bounds of a circle and a square. “Vitruvian Man” has entered popular culture as an emblem of Leonardo’s genius — redolent of secret knowledge, referred to in the initial crime scene of “The Da Vinci Code” and reproduced on the face of...

The rest of my review is available free online at the website of The New York Times:

http://www.nytimes.com/2012/02/05/boo...