There were guardrails around the upper platform, but Shervane did not care to go near its edge. The ground was at a dizzying distance, and he tried to forget his height by helping Brayldon and the workmen erect the simple hoist that would lift him the remaining twenty feet. When it was ready he stepped into the machine and turned to his friend with all the assurance he could muster.
"I shall be gone only a few minutes," he said with elabo-
rate casualness. Whatever I find, I'll return immediately." He could hardly have guessed how small a choice was his.
Grayle was now almost blind and would not know another spring. But he recognized the approaching footsteps and greeted Brayldon by name before his visitor had time to speak.
"I am glad you came," he said. "I've been thinking of everything you told me, and I believe I know the truth at last. Perhaps you have guessed it already."
"No," said Brayldon. "I have been afraid to think of it."
The old man smiled a little.
"Why should one be afraid of something merely because it is strange? The Wall is wonderful, yes—but there's nothing terrible about it, to those who will face its secret without flinching.
"When I was a boy, Brayldon, my old master once said that time could never destroy the truth—it could only hide it among legends. He was right. From all the fables that have gathered around the Wall, I can now select the ones that are part of history.
"Long ago, Brayldon, when the First Dynasty was at its height, Trilorne was hotter than it is now and the Shadow Land was fertile and inhabited—as perhaps one day the Fire Lands may be when Trilorne is old and feeble. Men could go southward as they pleased, for there was no Wall to bar the way. Many must have done so, looking for new lands in which to settle. What happened to Shervane happened to them also, and it must have wrecked many minds—so many that the scientists of the First Dynasty built the Wall to prevent madness from spreading through the land. I cannot believe that this is true, but the legend says that it was made in a single day, with no labor, out of a cloud that encircled the world."
He fell into a reverie, and for a moment Brayldon did not disturb him. His mind was far in the past, picturing his world as a perfect globe floating in space while the Ancient Ones threw that band of darkness around the equator. False
though that picture was in its most important detail, he could never wholly erase it from his mind.
As the last few feet of the Wall moved slowly past his eyes, Shervane needed all his courage lest he cry out to be lowered again. He remembered certain terrible stories he had once dismissed with laughter, for he came of a race that was singularly free from superstition. But what if, after all, those stories had been true, and the Wall had been built to keep some horror from the world?
He tried to forget these thoughts, and found it not hard to do so once he had passed the topmost level of the Wall. At first he could not interpret the picture his eyes brought him: then he saw that he was looking across an unbroken black sheet whose width he could not judge.
The little platform came to a stop, and he noted with half-conscious admiration how accurate Brayldon's calculations had been. Then, with a last word of assurance to the group below, he stepped onto the Wall and began to walk steadily forward.
At first it seemed as if the plain before him was infinite, for he could not even tell where it met the sky. But he walked on unfaltering, keeping his back to Trilorne. He wished he could have used his own shadow as a guide, but it was lost in the deeper darkness beneath his feet.
There was something wrong: it was growing darker with every footstep he took. Startled, he turned around and saw that the disk of Trilorne had now become pale and dusky, as if seen through a darkened glass. With mounting fear, he realized that this was by no means all that had happened— Trilorne was smaller than the sun he had known all his life.
He shook his head in an angry gesture of defiance. These things were fancies; he was imagining them. Indeed, they were so contrary to all experience that somehow he no longer felt frightened but strode resolutely forward with only a glance at the sun behind.
When Trilorne had dwindled to a point, and the darkness
was all around him, it was time to abandon pretense. A wiser man would have turned back there and then, and Shervane had a sudden nightmare vision of himself lost in this eternal twilight between earth and sky, unable to retrace the path that led to safety. Then he remembered that as long as he could see Trilorne at all he could be in no real danger.
A little uncertainly now, he continued his way with many backward glances at the faint guiding light behind him. Trilorne itself had vanished, but there was still a dim glow in the sky to mark its place. And presently he needed its aid no longer, for far ahead a second light was appearing in the heavens.
At first it seemed only the faintest of glimmers, and when he was sure of its existence he noticed that Trilorne had already disappeared. But he felt more confidence now, and as he moved onward, the returning light did something to subdue his fears.
When he saw that he was indeed approaching another sun, when he could tell beyond any doubt that it was expanding as a moment ago he had seen Trilorne contract, he forced all amazement down into the depths of his mind. He would only observe and record: later there would be time to understand these things. That his world might possess two suns, one shining upon it from either side, was not, after all, beyond imagination.
Now at last he could see, faintly through the darkness, the ebon line that marked the Wall's other rim. Soon he would be the first man in thousands of years, perhaps in eternity, to look upon the lands that it had sundered from his world. Would they be as fair as his own, and would there be people there whom he would be glad to greet?
But that they would be waiting, and in such a way, was more than he had dreamed.
Grayle stretched his hand out toward the cabinet beside him and fumbled for a large sheet of paper that was lying
upon it. Brayldon watched him in silence, and the old man continued.
"How often we have all heard arguments about the size of the Universe, and whether it has any boundaries! We can imagine no ending to space, yet our minds rebel at the idea of infinity. Some philosophers have imagined that space is limited by curvature in a higher dimension—I suppose you know the theory. It may be true of other universes, if they exist, but for ours the answer is more subtle.
"Along the line of the Wall, Brayldon, our Universe comes to an end—and yet does not. There was no boundary, nothing to stop one going onward before the Wall was built. The Wall itself is merely a man-made barrier, sharing the properties of the space in which it lies. Those properties were always there, and the Wall added nothing to them,"
He held the sheet of paper toward Brayldon and slowly rotated it,
"Here," he said, "is a plain sheet. It has, of course, two sides. Can you imagine one that has not?"
Brayldon stared at him in amazement. "That's impossible—ridiculous!"
"But is it?" said Grayle softly. He reached toward the cabinet again and his fingers groped in its recesses. Then he drew out a long, flexible strip of paper and turned vacant eyes to the silently waiting Brayldon.
"We cannot match the intellects of the First Dynasty, but what their minds could grasp directly we can approach by analogy. This simple trick, which seems so trivial, may help you to glimpse the truth."
He ran his fingers along the paper strip, then joined the two ends together to make a circular loop.
"Here I have a shape which is perfectly familiar to you— the section of a cylinder. I run my finger around the inside, so —and now along the outside. The two surfaces are quite distinct: you can go from one to the other only by moving through the thickness of the strip. Do you agree?"
"Of course," said Brayldon, still puzzled. "But what does it prove?"
"Nothing," said Grayle. "But now watch—"
This sun, Shervane thought, was Trilorne's identical twin. The darkness had now lifted complet
ely, and there was no longer the sensation, which he would not try to understand, of walking across an infinite plain.
He was moving slowly now, for he had no desire to come too suddenly upon that vertiginous precipice. In a little while he could see a distant horizon of low hills, as bare and lifeless as those he had left behind him. This did not disappoint him unduly, for the first glimpse of his own land would be no more attractive than this.
So he walked on: and when presently an icy hand fastened itself upon his heart, he did not pause as a man of lesser courage would have done. Without flinching, he watched that shockingly familiar landscape rise around him, until he could see the plain from which his journey had started, and the great stairway itself, and at last Brayldon's anxious, waiting face.
Again Grayle brought the two ends of the strip together, but now he had given it a half-twist so that the band was kinked. He held it out to Brayldon.
"Run your finger around it now," he said quietly.
Brayldon did not do so: he could see the old man's meaning.
"I understand," he said. "You no longer have two separate surfaces. It now forms a single continuous sheet—a one-sided surface—something that at first sight seems utterly impossible."
"Yes," replied Grayle very softly. "I thought you would understand. A one-sided surface. Perhaps you realize now why this symbol of the twisted loop is so common in the ancient religions, though its meaning has been completely lost. Of course, it is no more than a crude and simple analogy—an
example in two dimensions of what must really occur in three. But it is as near as our minds can ever get to the truth."
There was a long, brooding silence. Then Grayle sighed deeply and turned to Brayldon as if he could still see his face.
"Why did you come back before Shervane?" he asked, though he knew the answer well enough.
"We had to do it," said Brayldon sadly, "but I did not wish to see my work destroyed."
Grayle nodded in sympathy.
"I understand," he said.
Shervane ran his eye up the long flight of steps on which no feet would ever tread again. He felt few regrets: he had striven, and no one could have done more. Such victory as was possible had been his.
Slowly he raised his hand and gave the signal. The Wall swallowed the explosion as it had absorbed all other sounds, but the unhurried grace with which the long tiers of masonry curtsied and fell was something he would remember all his life. For a moment he had a sudden, inexpressibly poignant vision of another stairway, watched by another Shervane, falling in identical ruins on the far side of the Wall.
But that, he realized, was a foolish thought: for none knew better than he that the Wall possessed no other side.
Bishop's Lydeard, Somerset August 1946
No Morning After
Tales of cosmic doom have long been a science-fiction staple, and are now a glut on the market. But here is one with a difference; offhand, I can't remember another humorous story about the End of the World.
"But this is terrible!" said the Supreme Scientist. "Surely there is something we can do!"
"Yes, Your Cognizance, but it will be extremely difficult. The planet is more than five hundred light-years away, and it is very hard to maintain contact. However, we believe we can establish a bridgehead. Unfortunately, that is not the only problem. So far, we have been quite unable to communicate with these beings. Their telepathic powers are exceedingly rudimentary—perhaps even nonexistent. And if we cannot talk to them, there is no way in which we can help."
There was a long mental silence while the Supreme Scientist analyzed the situation and arrived, as he always did, at the correct answer.
"Any intelligent race must have some telepathic individuals," he mused. "We must send out hundreds of observers, tuned to catch the first hint of stray thought. When you find a single responsive mind, concentrate all your efforts upon it. We must get our message through."
"Very good, Your Cognizance. It shall be done."
Across the abyss, across the gulf which light itself took half a thousand years to span, the questing intellects of the planet Thaar sent out their tendrils of thought, searching desper-
ately for a single human being whose mind could perceive their presence. And as luck would have it, they encountered William Cross.
At least, they thought it was luck at the time, though later they were not so sure. In any case, they had little choice. The combination of circumstances that opened Bill's mind to them lasted only for seconds, and was not likely to occur again this side of eternity.
There were three ingredients in the miracle: it is hard to say if one was more important than another. The first was the accident of position. A flask of water, when sunlight falls upon it, can act as a crude lens, concentrating the light into a small area. On an immeasurably larger scale, the dense core of the Earth was converging the waves that came from Thaar. In the ordinary way, the radiations of thought are unaffected by matter—they pass through it as effortlessly as light through glass. But there is rather a lot of matter in a planet, and the whole Earth was acting as a gigantic lens. As it turned, it was carrying Bill through its focus, where the feeble thought impulses from Thaar were concentrated a hundredfold.
Yet millions of other men were equally well placed: they received no message. But they were not rocket engineers: they had not spent years thinking and dreaming of space until it had become part of their very being.
And they were not, as Bill was, blind drunk, teetering on the last knife-edge of consciousness, trying to escape from reality into the world of dreams, where there were no disappointments and setbacks.
Of course, he could see the Army's point of view. "You are paid, Dr. Cross," General Potter had pointed out with unnecessary emphasis, "to design missiles, not—ah—spaceships. What you do in your spare time is your own concern, but I must ask you not to use the facilities of the establishment for your hobby. From now on, all projects for the computing section will have to be cleared by me. That is all."
They couldn't sack him, of course: he was too important.
But he was not sure that he wanted to stay, he was not really sure of anything except that the job had backfired on him, and that Brenda had finally gone off with Johnny Gardner— putting events in their order of importance.
Wavering slightly, Bill cupped his chin in his hands and stared at the whitewashed brick wall on the other side of the table. The only attempt at ornamentation was a calendar from Lockheed and a glossy six-by-eight from Aerojet showing L'il Abner Mark I making a boosted take-off. Bill gazed morosely at a spot midway between the two pictures, and emptied his mind of thought. The barriers went down. . . .
At that moment, the massed intellects of Thaar gave a soundless cry of triumph, and the wall in front of Bill slowly dissolved into a swirling mist. He appeared to be looking down a tunnel that stretched to infinity. As a matter of fact, he was.
Bill studied the phenomenon with mild interest. It had a certain novelty, but was not up to the standard of previous hallucinations. And when the voice started to speak in his mind, he let it ramble on for some time before he did anything about it. Even when drunk, he had an old-fashioned prejudice against starting conversations with himself.
"Bill," the voice began, "listen carefully. We have had great difficulty in contacting you, and this is extremely important."
Bill doubted this on general principles. Nothing was important any more.
"We are speaking to you from a very distant planet," continued the voice in a tone of urgent friendliness. "You are the only human being we have been able to contact, so you must understand what we are saying."
Bill felt mildly worried, though in an impersonal sort of way, since it was now rather hard to focus on his own problems. How serious was it, he wondered, when you started to hear voices? Well, it was best not to get excited. You can take it or leave it, Dr. Cross, he told himself. Let's take it until it gets to be a nuisance.
"OK," he answered
with bored indifference. "Go right
ahead and talk to me. 1 won't mind as long as it's interesting."
There was a pause. Then the voice continued, in a slightly worried fashion.
"We don't quite understand. Our message isn't merely interesting. It's vital to your entire race, and you must notify your government immediately."
"I'm waiting," said Bill. "It helps to pass the time."
Five hundred light-years away, the Thaarns conferred hastily among themselves. Something seemed to be wrong, but they could not decide precisely what. There was no doubt that they had established contact, yet this was not the sort of reaction they had expected. Well, they could only proceed and hope for the best.
"Listen, Bill," they continued. "Our scientists have just discovered that your sun is about to explode. It will happen three days from now—seventy-four hours, to be exact. Nothing can stop it. But there's no need to be alarmed. We can save you, if you'll do what we say."
"Go on," said Bill. This hallucination was ingenious.
"We can create what we call a bridge—it's a kind of tunnel through space, like the one you're looking into now. The theory is far too complicated to explain, even to one of your mathematicians."
"Hold on a minute!" protested Bill. "I am a mathematician, and a darn good one, even when I'm sober. And I've read all about this kind of thing in the science-fiction magazines. I presume you're talking about some kind of short cut through a higher dimension of space. That's old stuff—pre-Einstein."
A sensation of distinct surprise seeped into Bill's mind.
"We had no idea you were so advanced scientifically," said the Thaarns. "But we haven't time to talk about the theory. All that matters is this—if you were to step into that opening in front of you, you'd find yourself instantly on another planet. It's a short cut, as you said—in this case through the thirty-seventh dimension."