So rare were these idle days

In building models for their complexity and challenge, Yuk Fu discovered a means to direct the ceaseless energy emanating from atop his bald skull. This he did on the few precious days when enough food was in the larder, the crops were growing healthy, his family was in good health, and there were no attackers charging down the mountainside. So rare were these idle days that when as a young man they came Fu took to throwing rocks for distance or knocking them with a stick. It was the reintroduction of sports in the split-hoof valley. A previous people faced the same boredom but kept no records. As an old man who saved his muscles for tasks of survival, Fu channeled this energy into his constructions. More at rest, his wife gave him smaller portions. There were the children. Yet Fu ate as much as ever. He could not know the brain demands as many calories as the body.