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They were faster than they looked. Falk put his head down and tried to make his heavy boots move to a quicker rhythm. Almost to the door, he looked back again. The lizard was one jump away, its grimy, ball-tipped fingers outspread.

Falk turned in desperation and, as the lizard came up, swung a knotted fist to the point of its snout. He heard its steam-whistle screech, saw it collapse, and then he was diving through the open door ahead.

The door closed gently behind him - a sheet of glassy substance, the same blue as the walls, gliding down to seal the opening.

Falk stared at it. Through its transparency he could see the dark shapes of the lizards crowding around, leaning to pry at the bottom of the door, gesticulating at each other. It was plain, at any rate, that the door was not going to open for them.

Whether it would open for him, when he wanted it to, was another matter.

He looked around him. The building was a single huge room, so long and deep that he could barely see the far walls. Scattered over the floor, patternless, were boxes, or chests, racks, shelves, little ambiguous mounds. Nearly all the objects Falk could see were fashioned of the same glass-like material.

There was no dust in the room; but now that Falk thought of it, he realized that there had been none in any of the Doorways, either How that was done he could not conjecture. He moved to the nearest object, a file, or rack formed apparently to take many things of divers shapes and sizes. It was a quarter empty now, and the remaining contents had a jumbled look.

He picked up an orange glass spindle, full of embedded threads, or flaws that looped in a curious pattern from one end to the other. He put it down, took a hollow sphere of opal. It was made in halves and seemed to be empty, but Falk could find no way to take it apart. He replaced it and took a brown object shaped like a double crescent, with a clear fracture plane running diagonally through it…..

Half an hour later he realized that he was not going to find any picture books or engineering manuals or any one thing that would unlock the mystery of the Doorway people for him. If there were any knowledge to be gained here, it would have to come from the building as a whole.

The lizards distracted him. He could see them through the walls of the building, pressing their snouts against the glass, staring with little round eyes, gesturing at him. But he learned things from them.

The group broke up finally, leaving only one to guard the exit; the others dispersed. Falk saw one go into the building directly across the plaza. The door closed behind him. A little later another one approached and pounded on the door; but it did not open until the first lizard came close to it inside. Some automatic mechanism, beyond Falk’s fathoming, evidently responded to the presence or absence of any living thing inside each building. When the last person left, the door stayed open; when another person entered, it shut and would not open for the next unless the first person allowed it.

That added one item to the description of the Doorway people that Falk was building in his mind. They were not property-conscious - not afraid that thieves would enter in their absence, for the doors stood open when they were gone - but they respected each other’s love of privacy.

Falk had previously thought of this building as a vast factory or laboratory or dormitory - a place designed to serve a large number of people, anyhow. Now he revised his opinion. Each building, he thought, was the private domain of one person - or, if they had family groups, only two or three. But how could one person use all this space, all these possessions?

He made the comparison that by now was becoming automatic. He asked himself what a cliff dweller would make of a millionaire’s triplex apartment in New York.

It helped, but not enough. The objects around him were all specialized tools; they would not function for him and so told him nothing about the Doorway builders. There was nothing that he could compare to a bed, to a table, to a shower bath. He could not see the people who had lived here.

With an effort, he forced himself to stop thinking in terms of men. The facts were important, not his prejudices. And then what had been a barrier became a road. There were no beds, tables, showers? Then the Doorway people did not sleep; they did not eat; they did not bathe.

Probably, thought Falk, they did not die.

They were fit to live among the stars…

The riddle of the deserted chamber mocked him. How, having built this city, would they leave it? How would they spread the network of the Doorways across the face of the galaxy, and then leave it unused?

The first question answered itself. Looking at the littered chamber, Falk thought of his comparison of the cliff dweller and the millionaire and humbly acknowledged his presumption. Not a millionaire’s triplex, he told himself… a tent.

Once there had been something of particular interest on this world. No telling what it had been, for that had been some millions of years ago when Mars was a living world. But the Doorway people, a few of them, had come here to observe it. When they were finished, they had gone away, leaving their tents behind, as a man might abandon a crude shelter of sticks and leaves.

And the other things they had left behind them? The cubes, cones, rods, odd shapes, each one beyond price to a man? Empty cans, thought Falk; toothpaste tubes, wrapping paper.

They had abandoned this city and the million things in it because they were of no value.

The sun was redder, nearer the horizon. Falk looked at the chronometer strapped to the wrist of his suit and found to his surprise that it was more than five hours since he had left Wolfert on Mars.

He had not eaten. He took food out of his pack and looked at the labels on the cans. But he was not hungry; he did not even feel tired.

He watched the lizards outside. They were scurrying around the plaza now, bringing armloads of junk from the building, packing them into big red boxes. As Falk watched, a curious construction floated into view down at the far end of the plaza. It was a kind of airboat, an open shell with two lizards riding it, supported by two winglike extensions with streamlined, down-pointing shapes at their ends.

It drifted slowly until it hovered over the pile of boxes the lizards had gathered. Then a hatch opened in its belly, and a hook emerged at the end of three cords. The lizards on the plaza began slinging loops of cord from their boxes to the hook.

Falk watched them idly. The hook began to rise, dragging the boxes after it, and at the last moment one of the lizards tossed another loop over it.

The new box was heavy; the hook stopped when it took up the slack, and the airboat dipped slightly. Then it rose again, and the hook rose too, until the whole load was ten feet off the ground.

Abruptly one of the three cords snapped; Falk saw it whip through the air, saw the load lurch ponderously to one side, and the airboat dip. Simultaneously the pilot sent the boat down to take up the strain on the remaining cords.

The lizards were scattering. The load struck heavily; and a moment later so did the airboat. It bounced, skidded wildly, and came to rest as the pilot shut off the power.

The lizards crowded around again, and the two in the airboat climbed down for an interminable conference. Eventually they got aboard again, and the boat rose a few feet while the lizards beneath disengaged the hook. Then there was another conference. Falk could see that the doors of the boat’s hatch were closed and had a crumpled look. Evidently they were jammed and could not be opened again.

Finally the boat came down once more, and with much argument and gesticulation the boxes were unpacked and some of their contents reloaded into two boxes, these being hoisted with much effort into the airboat’s cockpit. The rest was left strewn around the plaza.