According to the early Roman architect Vitruvius, there are certain proportions that are typical of the human body. These include the following:

A palm is the width of four fingers

A foot is the width of four palms

A man’s height is 24 palms

The length of a man’s outspread arms is equal to his height

The distance from the hairline to the bottom of the chin is 1/10 of a man’s height

The distance from the top of the head to the bottom of the chin is 1/8 of a man’s height

The distance from the elbow to the tip of the hand is 1/5 of a man’s height

The distance from the elbow to the armpit is 1/8 of a man’s height

The length of the hand is 1/10 of a man’s height

The distance from the bottom of the chin to the nose is 1/3 of the length of the head

The distance from the hairline to the eyebrows is 1/3 of the length of the face

The length of the ear is 1/3 of the length of the face

Leonardo da Vinci noted that the length of the human face (from chin to top of the head) is 1/7 of the length of the human body