One evening in the year minus ninety-eight thousand and seventy-six--that is, one hundred thousand years ago--Ogi, the son of Og, sat in front of a blazing fire in the cave, licking his greasy lips and wiping his greasy fingers upon the thick brown hair of his chest. The grease on Ogi’s lips and fingers had come from a chunk out of an aurochs, which Ogi had roasted on a sharpened stick before the fire. The tribe had been hunting that day, and Ogi himself had driven the spear through the eye of the great creature. Being young, he was a hero; and now he had a hero’s share of meat in him, and sat before the fire, sleepy-eyed, retracing in dull, slow revery the incidents of the hunt. In his hand was the toasting-stick, and he toyed with it, making marks upon the ground. Presently, half involuntarily, there came a pattern into these marks: a long mark--that was how the body of the aurochs went; two marks in front, the forelegs of the aurochs; two marks in back, the hind legs; a big scratch in front, the head. And suddenly Ogi found a thrill running over him. There was the great beast before him, brought magically back to life by markings in the dirt. Ogi had made the first picture! But then terror seized him. He lived in a world of terror, and always had to act before he dared to think. Hastily he scratched over the dirt, until every trace of the magic beast was gone. He gazed behind him, expecting to see the spirit of the aurochs, summoned into the cave by this fearful new magic. He glanced at the other members of his tribe, crouching sleepily about the fire, to see if they had noticed his daring venture. But nothing evil happened; the meat in Ogi’s stomach did not develop bad spirits that summer night, neither did the lightning poke him with its dagger, nor a tree-limb crash upon his head. Therefore, next evening a temptation came upon him; he remembered his marks, and ventured to bring back his magic aurochs, and sit before the fire and watch him toss his head and snort at his enemies. As time passed Ogi did a thing yet bolder; he made a straight up-and-down mark, with two prongs underneath, and a round circle on top; Ogi himself, a double Ogi, with his long spear stopping the monster’s charge! Even that did not prove bad magic; Ogi did not sicken, no lightning-daggers or tree-branches struck him. With practice, another idea came; he indicated the body of the aurochs by two marks, one above and one below, where the creature vanished into space. Between these were other scratches indicating a shaggy coat; and in the head a round spot, with a black hole punched deep by the toasting-stick--the eye of the monster, glaring balefully at Ogi, and filling him with such thrills as had never before passed along the nerves of a living organism.