In a cave hunched against the cold outside a man sat in a flickering firelight. He was clad in animal skins, and his hair was matted and tangled as it hung over his shoulders. He stirred, smashed, and ground in a crude bowl a substance which he studied intently. Satisfied with the mixture he dipped his index finger in and reached toward the cave wall. After a few dips of his finger the shape of a crudely drawn bison took shape on the wall. The figures of four men were added and a hunting scene took shape. Spears then were placed to show the triumphant conclusion. Satisfied he wiped his fingers on one of his leather leggings and smiled. A good day.