There was a man who sat each day looking out through a narrow vertical opening
where a single board had been removed from a tall wooden fence. Each day a w
ild ass of the desert passed outside the fence and across the narrow opening -
- first the nose, then the head, the forelegs, the long brown back, the hindle
gs, and lastly the tail. One day, the man leaped to his feet with the light o
f discovery in his eyes and he shouted for all who could hear him: "It is obv
ious! The nose causes the tail!"

-Stories of the Hidden Wisdom, from the Oral History of Rakis