"What was it he wanted?" Dvali asked. "To find the fallen artifacts, presumably—but what then?"

"I don't know," Sulean said. "I suppose like calls to like. The same instinct or programming that causes the Hypothetical replicators to cluster and share information and reproduce may have operated equally on the boy Esh. The crisis was caused by his proximity to these devices."

"As is Isaac's?" Mrs. Rebka asked.

"Possibly."

"Your people must have asked these questions."

"Without finding any answers, unfortunately."

Dvali said, "You told us the boy died."

"Yes."

"Tell us how."

Sulean thought: Must I? Must I endure this yet again?

Of course she must. Today, as every other day.

* * * * *

He had been gone from the Station for hours and it was well after dark when Suleans resolve broke.

Frightened by the thought of Esh alone in the night, and shaken by the anxiety and alarms that ran through the Station like electricity in the absence of the boy, she sought out the man she considered the kindest of her mentors, her astronomy instructor, who used the single name Lochis. She had seen Esh this afternoon, she told him through a gush of guilty tears. When Lochis finally understood, he ordered her to stay where she was while he assembled a search party.

A group of five men and three women, all experienced in the hazards and geography of the desert, left the Station at dawn. They rode in a cart pulled by one of the Station's few large machines—large machines were a luxury on a resource-poor planet—and Sulean was allowed to ride along to point out where she had last seen Esh and perhaps to help convince him to return to the Station, should they find him.

More sophisticated machines, lighter-than-air remote viewing devices and the like, had already been sent from the nearest large city, but they wouldn't arrive for another day. Until then, Lochis told her, it would be a labor of eyesight and intuition. Fortunately Esh had not been able to conceal his tracks, and it was obvious that he was heading for the most concentrated infall of Ab-ashken remains.

As the expedition crossed a line of low hills into the low basinland of the southern desert, Sulean saw the decaying evidence of that infall. The machine-drawn cart passed close to a clump of dried and decaying… well, things, was the only word Sulean could apply to it. A wide-mouthed tube, yellowish-white and more than two people high, towered over a cluster of orbs, pyramids, and slivered mirrors. All these things had simply grown out of the pebbly desert floor and died. Or almost died. A few feathery tendrils, like enormous bird feathers, stirred feebly amidst the surrealistic rubble. Or maybe it was the faint dry wind that made them move.

Suleans first confrontation with the Hypothetical had been when she looked into Esh's altered eyes. This was her second. She shivered despite the heat and shrank back against Lochis's protective bulk.