The Ul Kworn paused in his search for food, extended his eye and considered the thing that blocked his path.

He hadn’t notice the obstacle until he had almost touched it. His attention had been focused upon gleaning every feeder large enough to be edible from the lichens that covered his feeding strip. But the unexpected warmth radiating from the object had startled him. Sundown was at hand. There should be nothing living or non-living that radiated a fraction of the heat that was coming from the gleaming metal wall which lay before him. He expanded his mantle to trap the warmth as he pushed his eye upward to look over the top. It wasn’t high, just high enough to be a nuisance. It curved away from him toward the boundaries of his strip, extending completely across the width of his land.

A dim racial memory told him that this was an artefact, a product of the days when the Folk had leisure to dream and time to build. It had probably been built by his remote ancestors millennia ago and had just recently been uncovered from its hiding place beneath the sand. These metal objects kept appearing and disappearing as the sands shifted to the force of the wind. He had seen them before, but never a piece so large or so well preserved. It shone as though it had been made yesterday, gleaming with a soft silvery luster against the blue-black darkness of the sky.

As his eye cleared the top of the wall, he quivered with shock and astonishment. For it was not a wall as he had thought. Instead, it was the edge of a huge metal disc fifty raads in diameter. And that wasn’t all of it. Three thick columns of metal extended upward from the disc, leaning inward as they rose into the sky. High overhead, almost beyond the range of accurate vision, they converged to support an immense cylinder set vertically to the ground. The cylinder was almost as great in diameter as the disc upon which his eye first rested. It loomed overhead, and he had a queasy feeling that it was about to fall and crush him. Strange jointed excresences studded its surface, and in its side, some two-thirds of the way up, two smaller cylinders projected from the bigger one. They were set a little distance apart, divided by a vertical row of four black designs, and pointed straight down his feeding strip.

The Ul Kworn eyed the giant structure with disgust and puzzlement. The storm that had uncovered it must have been a great one to have blown so much sand away. It was just his fortune to have the thing squatting in his path! His mantle darkened with anger. Why was it that everything happened to him? Why couldn’t it have lain in someone else’s way, upon the land of one of his neighbors? It blocked him from nearly three thousand square raads of life-sustaining soil. To cross it would require energy he could not spare. Why couldn’t it have been on the Ul Caada’s or the Ul Varsi’s strip--or any other of the numberless Folk? Why did he have to be faced with this roadblock?

He couldn’t go around it since it extended beyond his territory and, therefore, he’d have to waste precious energy propelling his mass up the wall and across the smooth shining surface of the disc--all of which would have to be done without food, since his eye could see no lichen growing upon the shiny metal surface.

The chill of evening had settled on the land. Most of the Folk were already wrapped in their mantles, conserving their energy until the dawn would warm them into life. But Kworn felt no need to estivate. It was warm enough beside the wall.

The air shimmered as it cooled. Microcrystals of ice formed upon the legs of the structure, outlining them in shimmering contrast to the drab shadowy landscape, with its gray-green cover of lichens stippled with the purple balls of the lichen feeders that clung to them. Beyond Kworn and his neighbors, spaced twenty raads apart, the mantled bodies of the Folk stretched in a long single line across the rolling landscape, vanishing into the darkness. Behind this line, a day’s travel to the rear, another line of the Folk was following. Behind them was yet another. There were none ahead, for the Ul Kworn and the other Ul were the elders of the Folk and moved along in the first rank where their maturity and ability to reproduce had placed them according to the Law.

Caada and Varsi stirred restlessly, stimulated to movement by the heat radiating from the obstacle, but compelled by the Law to hold their place in the ranks until the sun’s return would stimulate the others. Their dark crimson mantles rippled over the soil as they sent restless pseudopods to the boundaries of their strips.

They were anxious in their attempt to communicate with the Ul Kworn.

But Kworn wasn’t ready to communicate. He held aloof as he sent a thin pseudopod out toward the gleaming wall in front of him. He was squandering energy; but he reasoned that he had better learn all he could about this thing before he attempted to cross it tomorrow, regardless of what it cost.

It was obvious that he would have to cross it, for the Law was specific about encroachment upon a neighbor’s territory. _No member of the Folk shall trespass the feeding land of another during the Time of Travel except with published permission. Trespass shall be punished by the ejection of the offender from his place in rank._

And that was equivalent to a death sentence.

He could ask Caada or Varsi for permission, but he was virtually certain that he wouldn’t get it. He wasn’t on particularly good terms with his neighbors. Caada was querulous, old and selfish. He had not reproduced this season and his vitality was low. He was forever hungry and not averse to slipping a sly pseudopod across the boundaries of his land to poach upon that of his neighbor. Kworn had warned him some time ago that he would not tolerate encroachment and would call for a group judgment if there was any poaching. And since the Folk were physically incapable of lying to one another, Caada would be banished. After that Caada kept his peace, but his dislike for Kworn was always evident.

But Varsi who held the land on Kworn’s right was worse. He had advanced to Ul status only a year ago. At that time there had been rumors among the Folk about illicit feeding and stealing of germ plasm from the smaller and weaker members of the race. But that could not be proved, and many young Folk died in the grim process of growing to maturity. Kworn shrugged. If Varsi was an example of the younger generation, society was heading hell-bent toward Emptiness. He had no love for the pushing, aggressive youngster who crowded out to the very borders of his domain, pressing against his neighbors, alert and aggressive toward the slightest accidental spillover into his territory. What was worse, Varsi had reproduced successfully this year and thus had rejuvenated. Kworn’s own attempt had been only partially successful. His energy reserves hadn’t been great enough to produce a viable offspring, and the rejuvenation process in his body had only gone to partial completion. It would be enough to get him to the winter feeding grounds. But as insurance he had taken a place beside Caada, who was certain to go into Emptiness if the feeding en route was bad.

Still, he hadn’t figured that he would have Varsi beside him.

He consoled himself with the thought that others might have as bad neighbors as he. But he would never make the ultimate mistake of exchanging germ plasm with either of his neighbors, not even if his fertility and his position depended upon it. Cells like theirs would do nothing to improve the sense of discipline and order he had so carefully developed in his own. His offspring were courteous and honorable, a credit to the Folk and to the name of Kworn. A father should be proud of his offspring, so that when they developed to the point where they could have descendants, he would not be ashamed of what they would produce. An Ul, Kworn thought grimly, should have some sense of responsibility toward the all-important future of the race.

His anger died as he exerted synergic control. Anger was a waster of energy, a luxury he couldn’t afford. He had little enough as it was. It had been a bad year. Spring was late, and winter had come early. The summer had been dry and the lichens in the feeding grounds had grown poorly. The tiny, bulbous lichen feeders, the main source of food for the Folk, had failed to ripen to their usual succulent fullness. They had been poor, shrunken things, hardly worth ingesting. And those along the route to the winter feeding grounds were no better.

Glumly he touched the wall before him with a tactile filament. It was uncomfortably warm, smooth and slippery to the touch. He felt it delicately, noting the almost microscopic horizontal ridges on the wall’s surface. He palpated with relief. The thing was climbable. But even as he relaxed, he recoiled, the filament writhing in agony! The wall had burned his flesh! Faint threads of vapor rose from where he had touched the metal, freezing instantly in the chill air. He pinched off the filament in an automatic protective constriction of his cells. The pain ceased instantly, but the burning memory was so poignant that his mantle twitched and shuddered convulsively for some time before the reflexes died.

Thoughtfully he ingested his severed member. With a sense of numbing shock he realized that he would be unable to pass across the disc. The implications chilled him. If he could not pass, his land beyond the roadblock would be vacant and open to preemption by his neighbors. Nor could he wait until they had passed and rejoin them later. The Law was specific on that point. _If one of the Folk lags behind in his rank, his land becomes vacant and open to his neighbors. Nor can one who has lagged behind reclaim his land by moving forward. He who abandons his position, abandons it permanently._

Wryly, he reflected that it was this very Law that had impelled him to take a position beside the Ul Caada. And, of course, his neighbors knew the Law as well as he. It was a part of them, a part of their cells even before they split off from their parent. It would be the acme of folly to expect that neighbors like Varsi or Caada would allow him to pass over their land and hold his place in rank.

Bitterness flooded him with a stimulation so piercing that Caada extended a communication filament to project a question. “What is this thing which lies upon your land and mine?” Caada asked. His projection was weak and feeble. It was obvious that he would not last for many more days unless feeding improved.

“I do not know. It is something of metal, and it bars my land. I cannot cross it. It burns me when I touch it.”

A quick twinge of excitement rushed along Caada’s filament. The old Ul broke the connection instantly, but not before Kworn read the flash of hope that Kworn had kindled. There was no help in this quarter, and the wild greed of Varsi was so well known that there was no sense even trying that side.

A surge of hopelessness swept through him. Unless he could find some way to pass this barrier he was doomed.

He didn’t want to pass into Emptiness. He had seen too many others go that way to want to follow them. For a moment he thought desperately of begging Caada and Varsi for permission to cross into their land for the short time that would be necessary to pass the barrier, but reason asserted itself. Such an act was certain to draw a flat refusal and, after all, he was the Ul Kworn and he had his pride. He would not beg when begging was useless.

And there was a bare possibility that he might survive if he closed his mantle tightly about him and waited until all the ranks had passed. He could then bring up the rear ... and, possibly, just possibly, there would be sufficient food left to enable him to reach the winter feeding grounds.

And it might still be possible to cross the disc. There was enough warmth in it to keep him active. By working all night he might be able to build a path of sand across its surface and thus keep his tissues from being seared by the metal. He would be technically violating the law by moving ahead of the others, but if he did not feed ahead, no harm would be done.

He moved closer to the barrier and began to pile sand against its base, sloping it to make a broad ramp to the top of the disc. The work was slow and the sand was slippery. The polished grains slipped away and the ramp crumbled time after time. But he worked on, piling up sand until it reached the top of the disc. He looked across the flat surface that stretched before him.

Fifty raads!

It might as well be fifty zets. He couldn’t do it. Already his energy level was so low that he could hardly move, and to build a raad-wide path across this expanse of metal was a task beyond his strength. He drooped across the ramp, utterly exhausted. It was no use. What he ought to do was open his mantle to Emptiness.

He hadn’t felt the communication filaments of Caada and Varsi touch him. He had been too busy, but now with Caada’s burst of glee, and Varsi’s cynical, “A noble decision, Ul Kworn. You should be commended,” he realized that they knew everything.

His body rippled hopelessly. He was tired, too tired for anger. His energy was low. He contemplated Emptiness impassively. Sooner or later it came to all Folk. He had lived longer than most, and perhaps it was his time to go. He was finished. He accepted the fact with a cold fatalism that he never dreamed he possessed. Lying there on the sand, his mantle spread wide, he waited for the end to come.

It wouldn’t come quickly, he thought. He was still far from the cellular disorganization that preceded extinction. He was merely exhausted, and in need of food to restore his energy.

With food he might still have an outside chance of building the path in time. But there was no food. He had gleaned his area completely before he had ever reached the roadblock.

Lying limp and relaxed on the ramp beside the barrier, he slowly became conscious that the metal wasn’t dead. It was alive! Rhythmic vibrations passed through it and were transmitted to his body by the sand.

A wild hope stirred within him. If the metal were alive it might hear him if he tried to communicate. He concentrated his remaining reserves of energy, steeled himself against the pain and pressed a communication filament against the metal.

“Help me!” he projected desperately. “You’re blocking my strip! I can’t pass!”

Off to one side he sensed Varsi’s laughter and on the other felt Caada’s gloating greed.

“I cannot wake this metal,” he thought hopelessly as he tried again, harder than before, ignoring the pain of his burning flesh.

Something clicked sharply within the metal, and the tempo of the sounds changed.

“It’s waking!” Kworn thought wildly.

There was a creaking noise from above. A rod moved out from the cylinder and twisted into the ground in Varsi’s territory, to the accompaniment of clicking, grinding noises. A square grid lifted from the top of the cylinder and began rotating. And Kworn shivered and jerked to the tremendous power of the words that flowed through him. They were words, but they had no meaning, waves of sound that hammered at his receptors in an unknown tongue he could not understand. The language of the Folk had changed since the days of the ancients, he thought despairingly.

And then, with a mantle-shattering roar, the cylinders jutting overhead spouted flame and smoke. Two silvery balls trailing thin, dark filaments shot out of the great cylinder and buried themselves in the sand behind him. The filaments lay motionless in the sand as Kworn, wrapped defensively in his mantle, rolled off the ramp to the ground below.

The silence that followed was so deep that it seemed like Emptiness had taken the entire land.

Slowly Kworn loosened his mantle. “In the name of my first ancestor,” he murmured shakily, “what was that?” His senses were shocked and disorganized by the violence of the sound. It was worse even than the roar and scream of the samshin that occasionally blew from the south, carrying dust, lichens, feeders and even Folk who had been too slow or too foolish to hide from the fury of the wind.

Gingerly, Kworn inspected the damage to his mantle. It was minor. A tiny rip that could easily be repaired, a few grains of sand that could be extruded. He drew himself together to perform the repairs with the least possible loss of energy, and as he did, he was conscious of an emanation coming from the filaments that had been hurled from the cylinder.

Food!

And such food!

It was the distilled quintessence of a thousand purple feeders! It came to his senses in a shimmering wave of ecstasy so great that his mantle glowed a bright crimson. He stretched a pseudopod toward its source, and as he touched the filament his whole body quivered with anticipation. The barrier was blotted from his thoughts by an orgy of shuddering delight almost too great for flesh to endure. Waves of pleasure ran through his body as he swiftly extended to cover the filament. It could be a trap, he thought, but it made no difference. The demands of his depleted body and the sheer vacuole-constricting delight of this incredible foodstuff made a combination too potent for his will to resist, even if it had desired to do so. Waves of pleasure rippled through him as more of his absorptive surface contacted the filament. He snuggled against it, enfolding it completely, letting the peristaltic rushes sweep through him. He had never fed like this as long as he could recall. His energy levels swelled and pulsed as he sucked the last delight from the cord, and contemplated the further pleasure waiting for him in that other one lying scarcely twenty raads away.

Sensuously, he extended a pseudopod from his upper surface and probed for the other filament. He was filled to the top of his primary vacuole but the desire for more was stronger than ever--despite the fact that he knew the food in the other filament would bring him to critical level, would force him to reproduce. The thought amused him. As far back as he could remember, no member of the Folk had ever budded an offspring during the Time of Travel. It would be unheard of, something that would go down through the years in the annals of the Folk, and perhaps even cause a change in the Law.