Then again, in the human body the central point is naturally the navel. For if a man be placed flat on his back, with his hands and feet extended, an… - Vitruvius

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Then again, in the human body the central point is naturally the navel. For if a man be placed flat on his back, with his hands and feet extended, and a pair of compasses centered at his navel, the fingers and toes of his two hands and feet will touch the circumference of a circle described therefrom.