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Photo Credits: The collage of images signifying a human being begins on the upper left with Leonardo da Vinci’s anatomical drawing, Mechanisms of the Ventricles of the Heart, the organ regarded as the seat of our “vital spirit” by the Greek physician Galen—a view that Leonardo, in fact, rejected in favor of nervous tissue, which is represented here (below left) by a modern fractal model of a neuron. The upper center photograph is an artist’s representation of DNA—the nucleic acid, usually in the form of a double helix, that contains the genetic instructions specifying the biological development of all cellular forms of life. At the right is the head of a woman.

Credits left to right: The Royal Collection © 2006 Her Majesty Queen Elizabeth II; Lawrence Lawry/Getty Images;; and Art Zone/Getty Images.