"I am to tell you what to do," he said.

Gornom looked grave. "I see what it is you do," he said. "It is a lesson. When you act for the masters, the great machines obey you."

"It is true," Cadnan said.

"This is the lesson," Gornom said slowly, as if it were truly important. "We are shown the machines so that we may learn to be like the machines. When the master tells us what to do, we are to do it. There is nothing else."

Cadnan thought about that. It made sense: it made a structure he could understand, and it made the world a less confusing place. "You have said a truth," he judged at last.

"It is one of many truths," Gornom said. And that was an invitation, Cadnan recognized. He hesitated no more than a second.

"Where may I learn the others?" But Gornom didn't answer, and Cadnan's breathing-space was over. He had to be back at the board, pushing buttons, watching carefully. Gornom stood behind him, peering over his shoulder with a cloudy eye. Neither said a word until the new spell of work was over. Then Cadnan repeated his question.

"It is not for all," Gornom said distantly. "One must be chosen."

"You have come to me," Cadnan said. "You have been sent to me. Is this what you call chosen?"

It was the right answer, perhaps the only right answer. Gornom pretended to consider the matter for a minute, but his mind was already made up. "We are above you, on the floor over yours," he said. "When our work is finished I will take you there."