Stan landed on the ground at the structure's edge. He could see streaks and bars of sky between the slabs. He looked down utterly empty aisles between the columns and saw nothing but the columns and the roof until the shafts merged in the distance. There was utter stillness here. The sand was untroubled and undisturbed. If the structure was a shelter, it sheltered nothing. Yet it stretched for at least a hundred miles in at least one direction, as he had seen from aloft. As nearly as he could tell, there was no reason for its existence and no purpose it could serve. Yet it was not the abandoned skeleton of something no longer used. It was plainly in perfect repair. The streaks of sky to be seen between its sections were invariably exact in size and alignment. They were absolutely uniform. There was no dilapidation and no defect anywhere. The whole structure was certainly artificial and certainly purposeful, and it implied enormous resources of civilization. But there was no sign of its makers, and Stan could not even guess at the reason for its construction. But he was too worn out to guess. On board the Stallifer, he'd been so sick with rage that he could not rest. On the space skid, riding in an enormous loneliness about a dwarf sun whose single planet had never been examined by men, he had to be alert. He had to find the system's one planet, and then he had to make a landing with practically no instruments. When he landed at the base of the huge grid, he examined his surroundings wearily, but with the cautious suspicion needful on an unknown world. Then he made the sort of camp the situation seemed to call for. He clamped the space skid and his supplies to his space suit belt, lay down hard by one of the columns, and incontinently fell asleep. He was wakened by a horrific roaring in his earphones. He lay still for one instant. When he tried to stir, it was only with enormous difficulty that he could move his arms and legs. He felt as if he were gripped by quicksand. Then, suddenly, he was wide awake. He fought himself free of clinging incumbrances. He had been half buried in sand. He was in the center of a roaring, swirling sand-devil which broke upon the nearby column and built up mounds of sand and snatched them away again, and flung great masses of it crazily in every direction. As the enigmatic structure had moved out of the dawn belt into the morning, howling winds had risen. All the fury of a tornado, all the stifling deadliness of a sandstorm, beat upon the base of the grid. And from what Stan had seen when he first tried to land, this was evidently the normal daily weather