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"Wait a second," said Derec. "Are you trying to tell me that in the history of this city, however brief, no robot has ever happened to be submerged, even accidentally, in a building as it changes or merges back into the city?"

"Naturally not, sir. There are many interior indications whenever a building is about to change, and our adherence to the Third Law prevents us from staying past the point where even accidental harm is a realistic possibility. Inaddition, the city would normally cease to act if a robot happened to remain inside because he had been rendered immobile through an accident. But I had neglected to foresee the implications of the special circumstances the city was dealing with at the time-the belief that it was under attack, the frantic restructuring, the raging environmental disaster… "

Forget it-you're a robot, not a seer. You couldn't have guessed just how badly the city's program was crashing. So what happened once you were submerged? What thoughts went through your mind?"

"Clear ones-the most logical ones I had ever had. Strangely, I felt no sense of time whatsoever. Reason indicated that I had only been submerged for a few decads, but for all practical intents and purposes my mind was flowing at a rate strongly emphasizing the subjectivity of the concept of time. Every moment I spent in the ebb stretched out for an eternity. And within those eternities, there stretched out an infinity of moments. I realized that for much of my brief existence I had lived in a state of dream-death, living, working, doing all the things I had been programmed to do, but holding back the realization of possibilities ignored. Now, I had no idea what to do about that, but I resolved to explore the appropriate possibilities, whatever they came to be.

"There came a moment when my sensors indicated I was no longer moving. I had become stationary, but the ebb was moving past me, running over me as though I had been strapped to a rock in turbulent rapids. The weight on my body gradually diminished, and I realized I was being held fast by the surface of the streets beneath the sinking building.

"And I was left lying on the surface as the final streams of meta-cells trickled over me, leaving my body fresh and cleansed. I, who had been immersed in a building, had an individualized idea of the sort of building Robot City should contain, the design and structure of which was imminent in my own experience."

"Didn't this strike you as being unusual?" asked Derec.

"No. In fact, it was logical. It was so logical that it made perfect sense to me. I had a purpose and I was going to achieve it. Beyond that, I had no interest in determining why I had it, because that did not appear to be important. I notice, however, from observing the behavior of my comrades, that I am not the only one striving to express something inside me. The ambition seems to be spreading."

"Like a plague," said Derec.

"Strangely, now the stars and clouds that had once fascinated me held no interest. All I cared about was fashioning, with the tools and instruments available tome, my idea into a reality. "

"You did not think that others would perhaps object?" asked Derec.

"It did not occur to consider the opinions of others at all. There was too much of an inner crackling in my transistors for me to be seized by distractions. My circuits had flashes of uncontrollable activity, and they made unexpected connections between thoughts I had once believed were entirely unrelated. These continuous flashes of realization came unbidden, at what seemed to be an ever-accelerating rate. I perceived still more buildings hidden in the flux, and all I had to do to find them was reach down into the pseudo-genetic data banks to shape them."

A hundred notions bloomed in Derec's mind. He had once believed that he understood robots, that he knew how they thought because he knew how their bodies and minds were put together. He believed he could take apart and reassemble the average model in half a day while blindfolded, and probably make a few improvements in the process. In fact, he bragged about it often to Ariel, not that she ever believed him.

Nevertheless, before this moment he had always imagined that an untraversable gulf lay between him and the robots. There was nothing about his mind, he had always assumed, that in the end bore much resemblance to their minds. Derec was a creature of flesh, composed of cells following complex patterns ordained by DNA-codes. Flesh and cells that had grown either in a womb or in an incubator (he wouldn't know which until he regained his memory). Flesh and cells that would one day be no more. Of these facts his subconscious was always aware.

While robots-while this robot was made of interchangeable parts. A robot's positronic potentials were naturally capable of endowing it with subtle personality traits, and they had always been able to take some initiative within the Three Laws. But even those initiatives were fairly dependable, predictable in hindsight because generally one robot thought like another.

However, it was rapidly becoming undeniable that, on this planet at least, the robotic mind resembled the human mind in that it was an adaptive response to selective pressures. From that point on, the possibilities were endless.

So Lucius was, in its own way, like the first fish that had crawled from the water onto the ground. Its positronic potentials had adapted to life in Robot City by taking definite evolutionary steps. And other robots weren't very far behind.

"Master? Are you well?" inquired Mandelbrot gently.

"Yes, I'm fine. It's just taking an effort to assimilate all this," Derec replied in a distracted tone, looking about for Ariel. He wanted to hear what she thought of what he had learned, but she was nowhere to be seen. Neither was Wolruf. They had both slipped away while he had been preoccupied. "Uh-and how are you, Lucius?"

"I'm well-functioning at peak capacity," said Lucius evenly. "Evidently merely talking things through has helped me."

"There's much more I'd like to ask you-about your building and how you went about it. I'm especially interested in how you dealt with the central computer and managed to alter some of the pseudo-genetic codes."

"Certainly, master, my mind and methods are at your disposal. But any reasonable explanation would take several hours. "

"That's quite all right. I've made an appointment with another robot in the morning, but I should finish with him in a few hours. Then I'd like to interview you."

"You don't wish to examine me?"

"No, I'm afraid taking you apart-even for a quick looksee-would cause you harm. I don't want you to change."

Lucius bowed slightly. "I suspected as much, but the confirmation is appreciated. "

"I would like to know one thing, though. Does your building have a name?"

"Why, yes. You're the first to ask. Its name is 'Circuit Breaker.' "

"An interesting name," said Mandelbrot. "May I ask what it means?"

"You may ask," replied Lucius. But that was all it said.

"Mandelbrot, I want you to do me a favor," said Derec.

"Certainly."

"Find Ariel and keep an eye on her. Don't let her find out you're around. Obviously, she wishes to be alone, but she obviously can't be in her condition."

"It has already been taken care of. I saw a ten percent probability of a First Law situation coming up but was sufficiently cognizant of her wishes to realize that privacy was her goal. So I signaled Wolruf to keep a watch on her. "

Derec nodded. "Good." He felt vaguely ashamed that he hadn't been on top of the situation earlier. Perhaps he was a little too self-involved for his own good. But he already felt better that Mandelbrot had automatically watched out for her interests, in a manner protecting both her body and her sense of self-identity. It seemed that for a robot to serve man most efficiently, it had to be something of a psychologist as well. Or at least a student of human nature.