From medieval sketches and 19th-century drawings by the founder of modern neuroscience to images produced using state-of-the-art techniques, the illustrations collected here allow us to see the fantastic networks in the human brain. These black-and-white and vibrantly colored images, many resembling abstract art, are employed daily by scientists around the world, but most are never seen by the general public. Carl Schoonover's captions provide detailed explanations of each image, while in the texts, scientists reveals the methods applied to study the mind, helping us to understand them, and offering clues about what may lie ahead.