The point is not to make another Earth. Not another Alaska or Tibet, not a Vermont nor a Venice, not even an Antarctica. The point is to make something new and strange, something Martian.

In a sense our intentions don’t even matter. Even if we try to make another Siberia or Sahara, it won’t work. Evolution won’t allow it, and at its heart this is an evolutionary process, an endeavour driven at a level below intention, as when life made its first miracle leap out of matter, or when it crawled out of sea onto land.

Again we struggle in the matrix of a new world. Of course all the genetic templates for our new biota are Terran; the minds designing them are Terran; but the terrain is Martian. And terrain is a powerful genetic engineer, determining what flourishes and what doesn’t, pushing along progressive differentiation, and thus the evolution of new species. And as the generations pass, all the members of a biosphere evolve together, adapting to their terrain in a complex communal response, a creative self-designing ability. This process, no matter how much we intervene in it, is essentially out of our control. Genes mutate, creatures evolve: a new biosphere emerges, and with it a new noosphere. And eventually the designers’ minds, along with everything else, have been forever changed.

This is the process of areoformation.

One day the sky fell. Plates of ice crashed into the lake, and then started thumping on the beach. The children scattered like frightened sandpipers. Nirgal ran over the dunes to the village and burst into the greenhouse, shouting, “The sky is falling, the sky is falling!” Peter sprinted out the doors and across the dunes faster than Nirgal could follow.

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 come out of 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 Crèche 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.

So like the others he concealed his dismay as the school door opened and the Bad Witch walked in. But on this day she seemed tired, and let them out on time even though they had done poorly at arithmetic. Nirgal followed Jackie and Dao out of the schoolhouse and around the corner, into the alley between Crèche Crescent and the back of the kitchen. Dao peed against the wall and Jackie pulled down her pants to show she could too, and just then Bad Witch came around the corner. She pulled them all out of the alley by the arm, Nirgal and Jackie clutched together in one of her talons, and right out in the plaza she spanked Jackie while shouting furiously at the boys. “You two stay away from her! She’s your sister!” Jackie, crying and twisting to pull up her pants, saw Nirgal looking at her, and she tried to hit him and Maya with the same furious swing, and fell over bare-bottomed and howled.

It wasn’t true that Jackie was their sister. There were twelve sansei children in Zygote, and they knew each other like brothers and sisters and many of them were, but not all. It was confusing and seldom discussed. Jackie and Dao were the oldest, Nirgal

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CONTENTS

PART ONE Areoformation