On his fortieth birthday Martin Sutter decided life was too short to continue in the rut that had been his existence for more than twenty years. He withdrew his savings from the Explosion City Third Federal Bank, stopped in a display room and informed a somewhat surprised clerk he was taking the electric runabout with the blue bonnet. The ground-car, complete with extras, retailed for a tidy three thousand credits.

To accustom himself to the car’s controls Sutter chose Highway 56 for a driving lesson. He tooled the electric runabout up into the third level, purred out across state at an effortless two hundred, then descended via a cloverleaf to ground tier and entered a maze of subsidiary roads that led through the summer countryside.

In this manner he drove the major part of the afternoon. Travel was light, away from the elevated lanes and he enjoyed himself.

At four o’clock he began to look for a convenient place to turn around. It was then that he sighted the roadside stand ahead. Above it a freshly painted sign read: TV SETS. LATEST MODELS. SPECIAL WHOLESALE PRICES!

Sutter smiled. Whoever heard of selling television sets on a country highway? It was like--why, it was like selling eggs in the lobby of the Hotel International! Then it occurred to him that his own TV set had not been in good working order for more than a year. The olfactory control had jammed last week while he was watching a Sumatran tribal ceremony, inland from Soerabaja, and he had been unable to smell the backdrop frangipani blossoms. It was time he bought a new set...

Sutter touched a stud and the electric runabout coasted to a halt. As he climbed out of the car and walked across the highway toward the stand, he thought for a moment there was something wrong with his contact lenses or perhaps his eyes.

The stand and the sign above it appeared to waver uncertainly, to become disjointed as though viewed through uneven glass. But the effect passed and Sutter approached the stand and nodded to the individual tilted back in a chair beside it.

He was a rawboned man with a thatch of thick black hair and small watery eyes. He was dressed, oddly enough, in a pair of tight-fitting trousers of white lawn, a flaming red tunic and a yellow cummerbund.

“Yes, sir,” he said. “Can I show you something in a new TV?”

“Where are they?” asked Sutter, surveying the empty stand.

“Out back,” replied the man. “Just a minute and I’ll show you.”

He rose lazily from his chair and led the way around to the rear of the stand. Sutter could have sworn he had seen an apple orchard behind the structure as he rode up, but he must have been mistaken for now he saw a low-roofed, aluminum-walled building there, huge doors open on one side. It looked, he thought, somewhat like a hangar...

Two hours later Sutter arrived back at his home in town. He parked the car, went around to the rear compartment, lifted out a large packing case and carried it to his sitting room. There, with the aid of hammer and crowbar, he stripped away the protective boards and then trundled the cabinet to an unoccupied corner.

It was certainly a unique TV set. A very new model, the salesman had said. The cabinet was shaped like a delta with a cube surmounted on the pointed end of the triangle. The cube held the screen, the triangle, the controls. Finished in a subdued ochre color, the set captured the light of the dying day that filtered through the bay window and gleamed with a soft radiance.

Sutter looked at the control panel and his smile of satisfaction faded somewhat. It looked a little complicated...

Instead of the usual knobs there were five small spoked wheels, each closely calibrated in lavender with resilient studs that seemed to be made of plush. Below this was a small dial with the legend Element of Probability lettered on it.

Sutter was about to switch on the set when the door buzzer sounded. He crossed to the door and pulled it open.

A tall gangly man stood there. Swarthy, face partially covered by a neatly trimmed beard, he looked the conventional picture of a story-book villain. He wore a broad-brimmed hat and an under-slung pipe was clamped in his teeth. He said in a deep booming voice, “Are you Mr. Martin Sutter?”

“Yes, I am. What can I do for you?”

The man said his name was Lucien Travail. He explained that he had been looking for a room and that Mrs. Conworth, the landlady, had informed him she had no vacancies but suggested that her roomer, Mr. Sutter, might be interested in a roommate.

“Of course I realize you don’t know me but I believe our strangeness will be offset by our mutual hobby.”

Sutter was silent, waiting for him to continue.

“I collect shells,” Travail said.

For thirty years Sutter had pursued a hobby which had begun in his boyhood days during summer vacations at the seashore--the collecting of exoskeletons of mollusks and crustaceans. Long ago his assortment of cowries, spiny combs and yellow dragon-castles had outgrown their glass cabinet and overflowed into three carefully catalogued packing cases.

To Sutter, anyone who liked shells was a person above suspicion. Thus it was that two days later, after a casual checking of the bearded man’s references, he invited Travail to move in with him.

During those two days Sutter tried unsuccessfully to put his new television set into operation. But the set refused to work. Turn the queer dials as he would, all he could get on the elliptical screen was a blur of blinding colors.

On the evening of the third day Travail looked up from his newspaper, said, “It says here that the president of the Federal Union Congress is going to make a speech in New Paris. Will you tune him in?”

Sutter frowned. “I would,” he said, “but my set is out of order. I should call a repair man, but I had hoped to get it regulated myself.”

Travail laid down his pipe. “Out of order, eh?” he said. “I’m sort of handy with gadgets. Let me take a look at it.”

He walked across to the cabinet, turned it around and stood peering at the complicated chassis. A small brass nameplate caught his eye: Manufactured by the Tanganyika Company, Dodoma, Empire of Tanganyika, East Africa. Under charter of the Atomic Commercial Enterprise Commission. Warning: Permit only an accredited employee of this company to touch wiring.

Travail snorted. “Accredited employee, my foot! I know as much about these things as they do.”

He went into the kitchen and returned with a screwdriver. While Sutter looked on with apprehensive eyes, he began to tinker with the wiring. Suddenly there was a dull report and a flash of flame. Travail jerked his arm back as a thin streamer of smoke and the smell of burning insulation entered the room.

“You’ve broken it,” said Sutter accusingly.

But his voice died abruptly as the screen flared into light and a low hum sounded behind the panel. An instant later the light became subdued and a streak of tawny yellow took form. The yellow slowly coalesced into a sandy stretch of beach with long rolling swells washing up on it, to recede in a smother of foam. Through the amplifier came the muted roar of the breakers and the low soughing of the wind.

“Well, we got something at any rate,” Travail said. “I wonder what it is.”

Sutter stared, fascinated. The view of the beach seemed to come into sharper focus as he watched, and he saw now that it was an incredibly lonely scene, with the sea stretching away to a vanishing point and a stand of stunted spruce flanking the width of sand. But what caught his eye and held him almost in a trance was the array of objects littering the sand at the water’s edge.

They were shells. Not the prosaic commonplace shells usually found on a New England shore nor even the brighter colored, more intricately formed shells of tropic seas. These were shells he had never seen before, even in library collections. Alien and soft-hued and lovely shells that caused his collector’s heart to jump wildly. He saw a delicate star-shaped thing that might have been fashioned of porcelain and enameled with the brush of the Mings. He saw spiral coverings from uncatalogued cephalopods, many chambered and many hued. He saw shells of a thousand shapes and designs, all incredibly beautiful...

Sutter forgot everything else as he sat there staring at that collector’s paradise.

“I’ll see if I can get something else,” said Travail.

“No!” said Sutter quickly. “Don’t touch it!”

He continued to stare hungrily at the alien shells until suddenly the scene before him grew dim, then faded completely away.

Travail laughed shortly. “Somebody sold you a fluke. This set must be an off brand. Incidentally, isn’t Tanganyika a colony governed by the Federal Union Congress?”

“Yes, it is,” replied Sutter. “I don’t understand this at all. There’s no Empire of Tanganyika.”

Next morning after breakfast Sutter announced that he was driving into the country to visit a friend. There was no reason why he should not have told his roommate the truth--that he was going to look up the man who had sold him the TV set. No reason except for the odd fact that Travail had made no mention of the alien shells, and Sutter kept thinking that a shell collector would have been immediately aware of the rareness of them.

Once again Sutter drove out across state and down the highway where he had seen the roadside stand. But when he reached the spot there was no sign of the stand. The big oak tree which had shaded it and the rail fence on the adjoining property were there. But no stand. As Sutter stared with perplexed eyes at the spot he saw something he had not noticed before.

At the edge of the highway was a large granite boulder with a bronze plate fastened to its slanting surface. Sutter got out of the car, approached it and read:

_This property has been preserved as a State Park to commemorate the

first successful trial explosion of the Hydrogen Bomb which took

place on this site and marked the beginning of an era._

It seemed to Sutter as he stood there that the surrounding silence grew more intense. Then he passed through a wide gateway and began to stride across an evenly clipped lawn toward a grove of trees beyond. Halfway he paused and glanced absently at his watch. It was exactly twelve o’clock noon.

And abruptly the scene before him slipped out of plumb. The sky and the lawn seemed to alter positions, to rotate madly as in a vortex. The whirling ceased and the next instant Sutter stood on the shore of a lonely sea with a tawny width of sand stretching out before him and the waves washing up almost at his feet. Then he saw the shells...

It was the beach of the alien shells! There they lay, scattered about the sand, hundreds, thousands of them, alien and delicate and lovely, exoskeletons the like of which he had never seen before. Their pastel colors blended with one another to form a horizontal rainbow extending into the measureless distance.

And somehow, as Sutter walked among them, picking his way with care, the years of his life seemed to slip away and he was a small boy at the seashore again, entranced with his first shell discovery. He could even hear his mother’s voice calling “Be careful, Martin! Don’t go too far!”

He walked on and on, slowly, uncertainly, until the beach and the sea began to waver like a heat mirage. And suddenly the shells and the water vanished and he was on the green grass again with the grove of trees just ahead. He turned, saw a white highway with his car parked on the shoulder.

Dazedly, Sutter walked back to the car...

All next morning he ruminated over his strange experience. Toward noon the pieces of the puzzle began to fit slowly together in his mind. But the partial answer at which he arrived seemed too fantastic for belief. Could it be possible that when he had stopped at the roadside stand he had blundered, in some inexplicable way, into another dimension?

Sutter had a layman’s knowledge of Einsteinian physics, and he knew that experiments in Time were being made every day. Only last week he had read in the paper of an army officer who had reportedly Time-traveled some twenty-two minutes. And a year ago the Belgian scientist, Delgar, claimed to have entered a secondary world which he declared impinged on our own.

Assuming all this to be true, then it could be that the Tanganyika television set was a product manufactured in Future Time by a company that, by Sutter’s Time standards, didn’t yet exist.

The following day saw Sutter begin an experiment of which he was rather proud. Travail had said that he had tried to tune in the noon news broadcast yesterday on the TV and had turned the set on from twelve o’clock until five minutes after. At a nearby appliance store Sutter purchased a clock control which would turn his television set on and off at any chosen time. He set the control for two o’clock, then managed to lure Travail out of the house for the afternoon by giving him an invitation he’d received for a lecture on marine life at a local club. Next, he drove again to the H-bomb site and stood waiting in the grass-like park, watch in hand.