Back on the beach great panes of ice stabbed the sand, and some chunks of dry ice fizzed in the water of the lake. When the children were all clumped around him Peter stood with his head craned back, staring at the dome so far above. “Back to the village,” he said in his no-nonsense tone. On the way there he laughed. “The sky is falling!” he squeaked, tousling Nirgal’s hair. Nirgal blushed and Dao and Jackie laughed, their frosted breath shooting out in quick white plumes.

Peter was one of those who climbed the side of the dome to repair it. He and Kasei and Michel spidered over the village in sight of all, over the beach and then the lake until they were smaller than children, hanging in slings from ropes attached to icehooks. They sprayed the flaw in the dome with water until it froze into a new clear layer, coating the white dry ice. When they came down they talked of the warming world outside. Hiroko had emerged from her little bamboo stand by the lake to watch, and Nirgal said to her, “Will we have to leave?”

“We will always have to leave,” Hiroko said. “Nothing on Mars will last.”

• • •

But Nirgal liked it under the dome. In the morning he woke in his own round bamboo room, high in Creche Crescent, and ran down to the frosty dunes with Jackie and Rachel and Frantz and the other early risers. He saw Hiroko on the far shore, walking the beach like a dancer, floating over her own wet reflection. He wanted to go to her but it was time for school.

They went back to the village and crowded into the schoolhouse coatroom, hanging up their down jackets and standing with their blue hands stretched over the heating grate, waiting for the day’s teacher. It could be Dr. Robot and they would be bored senseless, counting his blinks like the seconds on the clock. It could be the Good Witch, old and ugly, and then they would be back outside building all day, exuberant with the joy of tools. Or it could be the Bad Witch, old and beautiful; and they would be stuck before their lecterns all morning trying to think in Russian, in danger of a rap on the hand if they giggled or fell asleep. The Bad Witch had silver hair and a fierce glare and a hooked nose, like the ospreys that lived in the pines by the lake. Nirgal was afraid of her.