She showed him. At the south end of the mall there was a quadrangle of intact exterior walls where a steel fire escape was bolted in place. She had noticed it earlier in the day, she said. Turk surveyed it and decided it was sturdy enough to carry their weight, and yeah, maybe it was a good idea to look around while there was still some daylight left, if they were careful. So they climbed as far as the roof and stood on a steel mesh platform above the canopy of globes, in the simple light of the fading afternoon, and marveled at what they saw.

* * * * *

The view was similar to what Lise had seen this morning from the riggers' dorm, but it extended in every direction including the west—Isaac's direction, she thought dizzily—where something monstrous had grown out of the ground.

From this place above the canopy of the Dark Forest the ruins of human structures were easy to discern.

The long line of the collapsed mall lay across the body of the forest like a train wreck. The building where they had sheltered last night projected from the trees like the prow of a grounded ship, and farther off she could see the silhouettes of drill rigs and cracking towers and storage. Something was burning in the oil fields: the wind scrawled a line of black smoke across the horizon. Hypothetical growths carpeted the desert in every direction, reflecting the light of the setting sun and radiating their own, a sea of dark jewels, she thought. She wondered how much mass these things must have extracted from the ash or the ground or the air in order to grow themselves, wondered if the whole inland basin of Equatoria had been hollowed out to build them. And in the west, against the glare of the sun—

"Hold on," Turk said as a brisk wind rattled the platform, but her grip on the railing was already painfully tight.

In the west, something immense had arisen. A kind of Arch.

Lise had sailed under the Arch of the Hypothetical three times: twice as an adolescent, coming to Port Magellan with her parents (and leaving without her father), and once as an adult. That Arch, awe-inspiring as it was, had been too large to be perceived as a single thing: what you saw was the nearest leg, soaring beyond the atmosphere, or the part of it that continued to reflect sunlight in the hours after dark, a silvery blaze suspended over the sea.