That night Nirgal could not sleep at all. He kept feeling the transfusions, seeing every moment of them and imagining that there had been some kind of backwash in the system, so that he had been infected with the disease. Or contaminated by touch alone, why not? Or just by that last look in Simon’s eye! So that he had caught the disease they could not stop, and would die. Stiffen up, go mute, stop and go away. That was death. His heart pounded and a sweat broke through his skin, and he cried with the fear of it. There was no avoiding it; and it was horrible. Horrible no matter when it happened. Horrible that the cycle itself should work the way it did— that it should go around and around and around, while they lived only once and then died forever. Why live at all? It was too strange, too horrible. And so he shivered through the long night, his mind gone cyclonic with the fear of death.

4

After that he found it extremely hard to concentrate. He felt as if he was always at a remove from things, as if he had slipped into the white world and could not quite touch the green one.

Hiroko noticed this problem, and suggested he go with Coyote on one of his trips out. Nirgal was shocked by the idea, having never been more than a walk away from Zygote. But Hiroko insisted. He was seven years old, she said, and about to become a man. Time he saw a bit of the surface world.

A few weeks later Coyote dropped by, and when he left again Nirgal was with him, seated in the copilot’s seat of his boulder car, and goggling out the low windshield at the purple arch of evening sky. Coyote turned the car around to give him a view of the great glowing pink wall of the polar cap, which arced across the horizon like an enormous rising moon.

“It’s hard to believe something that big could ever melt,” Nirgal said.

“It will take a while.”

They drove north at a sedate pace. The boulder car was stealthed, covered by a hollowed-out rock shell that was thermally regulated to stay the same temperature as its surroundings, and it had a no-track device on the front axle to read the terrain and pass the information to the back axle, where scraper-shapers plowed their wheel tracks, returning the sand and rock to whatever shape they had had before their passing. So they could not race along.