"No," said Anthor, stubbornly, and he spoke, quite obviously, for the others.
"A circle has no end," repeated Munn, thoughtfully, and his forehead furrowed.
"Well," said Darell, impatiently, "it was clear to me- What is the one absolute fact we know about the Second Foundation, eh? I'll tell you! We know that Hari Seldon located it at the opposite end of the Galaxy. Homir Munn theorized that Seldon lied about the existence of the Foundation. Pelleas Anthor theorized that Seldon had told the truth that far, but lied about the location of the Foundation. But I tell you that Hari Seldon lied in no particular; that he told the absolute truth.
"But, what is the other end? The Galaxy is a flat, lens-shaped object. A cross section along the flatness of it is a circle, and a circle had no end - as Arcadia realized. We - we, the First Foundation - are located on Terminus at the rim of that circle. We are at an end of the Galaxy, by definition. Now follow the rim of that circle and find the other end. Follow it, follow it, follow it, and you will find no other end. You will merely come back to your starting point-
"And there you will find the Second Foundation."
"There?" repeated Anthor. "Do you mean here?"
"Yes, I mean here!" cried Darell, energetically. "Why, where else could it possibly be? You said yourself that if the Second Foundationers were the guardians of the Seldon Plan, it was unlikely that they could be located at the so-called other end of the Galaxy, where they would be as isolated as they could conceivably be. You thought that fifty parsecs distance was more sensible. I tell you that that is also too far. That no distance at all is more sensible. And where would they be safest? Who would look for them here? Oh, it's the old principle of the most obvious place being the least suspicious.
"Why was poor Ebling Mis so surprised and unmanned by his discovery of the location of the Second Foundation? There he was, looking for it desperately in order to warn it of the coming of the Mule, only to find that the Mule had already captured both Foundations at a stroke. And why did the Mule himself fail. in his search? Why not? If one is searching for an unconquerable menace, one would scarcely look among the enemies already conquered. So the Mind-masters, in their own leisurely time, could lay their plans to stop the Mule, and succeeded in stopping him.
"Oh, it is maddeningly simple. For here we are with our plots and our schemes, thinking that we are keeping our secrecy - when all the time we are in the very heart and core of our enemy's stronghold. It's humorous."
Anthor did not remove the skepticism from his face, "You honestly believe this theory, Dr. Darell?"
"I honestly believe it."
"Then any of our neighbors, any man we pass in the street might be a Second Foundation superman, with his mind watching yours and feeling the pulse of its thoughts."
"Exactly."
"And we have been permitted to proceed all this time, without molestation?"
"Without molestation? Who told you we were not molested? You, yourself, showed that Munn has been tampered with. What makes you think that we sent him to Kalgan in the first place entirely of our own volition - or that Arcadia overheard us and followed him on her own volition? Hah! We have been molested without pause, probably. And after all, why should they do more than they have? It is far more to their benefit to mislead us, than merely to stop us."
Anthor buried himself in meditation and emerged therefrom with a dissatisfied expression. "Well, then, I don't like it. Your Mental Static isn't worth a thought. We can't stay in the house forever and as soon as we leave, we're lost, with what we now think we know. Unless you can build a little machine for every inhabitant in the Galaxy."
"Yes, but we're not quite helpless, Anthor. These men of the Second Foundation have a special sense which we lack. It is their strength and also their weakness. For instance, is there any weapon of attack that will be effective against a normal, sighted man which is useless against a blind man?"
"Sure," said Munn, promptly. "A light in the eyes."
"Exactly," said Darell. "A good, strong blinding light."
"Well, what of it?" asked Turbor.
"But the analogy is clear. I have a Mind Static device. It sets up an artificial electromagnetic pattern, which to the mind of a man of the Second Foundation would be like a beam of light to us. But the Mind Static device is kaleidoscopic. It shifts quickly and continuously, faster than the receiving mind can follow. All right then, consider it a flickering light; the kind that would give you a headache, if continued long enough. Now intensify that light or that electromagnetic field until it is blinding - and it will become a pain, an unendurable pain. But only to those with the proper sense; not to the unsensed."
"Really?" said Anthor, with the beginnings of enthusiasm. "Have you tried this?"
"On whom? Of course, I haven't tried it. But it will work."
"Well, where do you have the controls for the Field that surrounds the house? I'd like to see this thing."
"Here." Darell reached into his jacket pocket. It was a small thing, scarcely bulging his pocket. He tossed the black, knob-studded cylinder to the other.
Anthor inspected it carefully and shrugged his shoulders. "It doesn't make me any smarter to look at it. Look Darell, what mustn't I touch? I don't want to turn off the house defense by accident, you know."
"You won't," said Darell, indifferently. "That control is locked in place." He flicked at a toggle switch that didn't move.
"And what's this knob?"