They were astounded by the slenderness of the plants. Grass fascinated them, and weeds. A large part of their courage came from the absence of debris upon the ground. In the valley, the habitation of a trapdoor spider was marked by grisly trophies--armor emptied of all meat but not yet rotted by the highly specialized bacteria which flourished upon chitin. The hunting-ground of even a mantis was marked by discarded, transparent beetle-wings and sharp spiny bits of armor, and mandibles not tasty enough to be consumed. Here, in the first hour of their exploration, they saw no sign that any insect from the lowlands had ever come to this place at all. But they interpreted the fact quite correctly as rarity, rather than complete absence of huge creatures blundering up into the sunlight. They were relieved that they had found a cave. There was no thicket of trees close-growing enough to shelter them. They were ludicrously amazed when they found that trees were hard and solid, because the fungi they knew were easily cut by sawtoothed tools. They found nothing to eat, but they were not yet hungry. They did not worry about it while they still had bits of edible mushroom from their climb. When the sun sank low and the crimson colorings filled the western horizon, they shivered. They watched the glory of their first sunset with scared, incredulous eyes. Yellows and reds and purples reared toward the zenith. It became possible to look and gaze directly at the sun. They saw it descend behind something they could not guess at. Then there was dark. The fact stunned them. So night came like this! Then they saw the stars as they winked singly into being. And the folk from the lowland crowded frantically into the cave with its faint odor of having once been occupied. They filled the cave tightly. But Burl was somewhat reluctant to admit his fear, and Saya lingered close to him. They were the last to enter. * * * * * Nothing happened. Nothing. The sounds of evening continued. They were strange but infinitely soothing and somehow what night-sounds ought to be. Burl and the others could not possibly analyze it, but for the first time in many generations they were in an environment really similar to that intended for their race. It had a rightness and a goodness about it which was perceptible for all its novelty. And because Burl had once been lost from his tribe, he was capable of estimating novelties a little better than the rest. He listened to the night-noises from close by the cave's small entrance. He heard the breathing of his tribesmen. He felt the heat of their bodies, keeping the crowded enclosure warm enough for all. Saya was close beside him. She held fast to his arm for reassurance. He was wakeful, and thinking very busily and very painfully.