The Body Machines(big pic) based on a poster by the artist Fritz Kahn from 1927.
"The image above, by the artist Fritz Kahn, shows the nervous system as a complex electronic signalling system, complete with buttons, charts and busy workers. Fritz Kahn's books and illustrations explored the inner machinery of the human body, using metaphors of modern industrial life. Kahn turned the brain into a complex factory with light projectors, conveyor belts, secretaries and cinema screens; he showed the journeys of blood cells as locomotives encircling the globe; and he compared bones to modern building materials such as reinforced concrete. "[ link ]