This drawing by Leonardo da Vinci illustrates the mathematical proportions found in human anatomy as described in the Golden Section or Mean. The hexagram framing the Vitruvian Man is more perfectly shown in the pentagram of Pythagoras, which can be broken into Golden Rectangles. At the bottom of the drawing is a coded message from Leonardo.
Note: Vitruvian Man is from 1492 . Named after a treatise on the proportions of the male human form by Vitruvius who was a Roman architect.