The Human Body.
There are seven openings in the head – two eyes, two ears and two nostrils, equally divided, three on each side. From this we get our Law of Three and know the reason why the change comes after two and in the third period. The seventh opening in the head is the mouth and everything goes down. Study your seven-year periods and see how your markets go down and make tops and bottoms.
W.D. Gann 1931.