He saw the ashfall. To Isaacs eyes it was a storm of stars, each grain distinctly bright and merging into a general brightness, an atmosphere of luminosity. Bright, yes, but also, somehow, transparent: he could see through it—especially to the west.

The infinitely tiny Hypothetical machines weren't falling at random. Taken together, their trajectories were focused on the place where something old was rising from the bedrock of the desert. It had stirred in its sleep like a lazy behemoth and the ground had trembled, canting the oil derricks and shattering pumps and pipelines. It had stirred and stirred again as more ash fell, triggered by unknowable cues into new activity.

And it stirred again now, ferociously. The earth didn't just shake this time, it roared, and although the merely human part of Isaac was blind in the darkness he heard quite clearly the groan of deep rock stressed to the fracturing point, the slap and crack of collapsing walls. He felt a rush of foul air, and his breath became labored and painful again.

But none of that mattered to the part of him that could see.

This is a machine, he thought, watching the great device heave itself out of the night desert a hundred and more miles to the west. Machine, yes, but it was alive… it was both. The words did not exclude one another. The voice in him that had been Jason Lawton's voice said: a living cell is a machine made of protein. What falls from the sky and what rises from the earth is just life by other means.

The giant structure shouldering itself out of the ground in the west resembled the Arch, or at least the pictures Isaac had seen of the Arch. It was a huge half-ring made of the same stuff as the dust that was falling from beyond the sky, condensed and differently arranged, its molecules and its unusual atoms subverting natural laws for which Isaac had no name but to which Jason Lawton's memory attached words like "strong force" and "weak force." It was lovely in its intrinsic glow, a rainbow shining in colors without names. It was an Arch for things to pass through; but it didn't lead to another planet.

Things were passing through it now. From the utter blackness inside it, where even Isaac couldn't see, luminous clouds ascended to the stars.

* * * * *

The thought of Jason lingered in Diane's mind even after she was hurt.

The earthquake happened in a series of jolting shocks, almost unbearable in the darkness. That much she understood, and she had been able to suppress her fear at least for the first few moments. Then the building began to collapse.