Pendulum

The camp went quiet for two days, and the quiet had a shape.

Nobody said the word counts anymore. The rosters still ran — water, perimeter, fruit — but the order in them had stopped mattering out loud. The last thing done for the score had put four people in the ground, and everybody had been at the burial. The men who had carried the poles worked the rotations and were spoken to politely and were not forgiven, and there was no procedure for either thing.

Ellis spent the first day carrying water, because water still needed carrying.

On the second day he went and found Kai, who was sitting against a crate re-lacing a running shoe for something to do.

"You have her things," Ellis said.

Kai looked up. Nobody had defined which things or whose. There was a small stack of them somewhere, items off four people that nobody had known what to do with. Kai had ended up holding them the same way he had ended up doing the count on the first day. Somebody does it. It is always the same kind of somebody.

"The watch," Ellis said. "Can I take the watch?"

"What for?"

He almost said something vague. The habit of it was actually in his mouth, something to do, and he heard himself put it down.

"She was measuring the place," he said. "I want to finish it."

Kai held his eyes for a second. Then he went into the crate and came out with the watch, steel, the crystal unmarked, still running, and handed it over without another question, which was its own kind of statement.

Here is what Ellis knew, sitting on the grass that evening with a dead pilot's watch on his knee.

The trees were half again too tall, and they were ordinary trees. The animals were far too large, and they moved like small ones. Everybody was lighter, by a lot, and had stopped noticing it inside a week. The air went further up than air went — the sky said so every night by never going fully dark. And the day was twenty-five hours and a little over, timed twice, mentioned once at a fire, ignored.

Five facts. On Earth they would be five separate mysteries.

He kept coming at it the way he came at a claim file, which was to assume it was one story until it refused to be. And it did not refuse. There was one suspect that touched everything on the list. It set what the trees could hold up. It set what a leg the size of a bridge pier could do. It set how hard his own body pressed on the ground, and how thick the air stayed with height, and it would even nudge a planet's spin over enough time.

How hard things fall. The single dumbest, most invisible fact in any world, the one nobody had ever needed to check in the whole history of being a person.

The cohort had checked it against their bodies on the first day, gotten their answer — lighter, stronger, better — and stopped.

He did not want a feeling. He wanted the number.

And the tools for the number, it turned out, were nothing at all. A weight. A string. A length he could trust. And a clock.

"You want my shoelace," Kai said.

"I want your shoelace."

"You know they took us with one pair of shoes each."

"You just re-laced them. It's the newest string in the camp."

Kai pulled it back out of the shoe without another word. What Ellis had, when he sat down at the flat spot by the fires, was this: a lace, a smooth stone the size of an egg, and the watch. He measured the lace against himself twice. He knew his own height off his license, and arm span is the same number. He had learned that at nine, from a poster in a doctor's office, and never once needed it since.

A weight on a string, swinging small, keeps its own time. It does not care how hard you throw it. It cares about two things only: how long the string is, and how hard the world pulls the weight down. That is the entire machine. It is why old clocks have pendulums in them.

He knew what a meter of string did at home, because every grandfather clock on Earth is the same clock: about one second, each way.

Kai crouched across from him with the watch. "Tell me when."

"Count me a hundred," Ellis said, and let the stone go.

The stone went out and came back, small and steady, in the blue evening light that would not finish going dark. A few people drifted over to watch, because there was nothing else happening in the camp. A man swinging a rock on a shoelace, with a dead woman's watch in play, was whatever else it was the only show on.

A hundred swings. Kai read the watch.

Ellis had the Earth number in his head. What the watch said was longer — not by a sliver, not by the kind of margin you argue with. Longer by a quarter.

He made Kai do it again, with fifty, while he held the lace pinched at the exact same place. It came back the same.

"What does that mean," Kai said, not quite as a question.

"It means it's not two percent," Ellis said. "It's not five. A third of it is missing. Gravity here is two-thirds of ours, and we have been walking around in it for six days telling ourselves we got stronger."

And then the whole world sat down into place at once, and it was very quiet in his head while it happened.

The trees were not strange. Water can only be lifted so high before the lift fails — and the ceiling is set by how hard the water is pulled down. Pull it down by two-thirds, and the ceiling goes up by half. The giants were not miracles. They were ordinary trees that had been allowed half again the headroom, and had spent a few million years taking it, as everything takes headroom, as the whole cohort had wanted to.

The animals were not fast for their size. They were the size that this pull made ordinary, with the speed that came with it. The nine on the first day had died of an assumption about a number nobody knew they were assuming.

The air stayed thick going up because the same pull that could not hold the trees down could not pack the sky down either. The sky was deep, and after sundown the light had more of it to bounce around in. The night never went black for the same reason a tree could be four hundred feet tall. It was all one sentence.

And the cohort had felt the one fact in the world that touched everything, felt it in the first minute, in their knees and their jumps — and had spent it on themselves. She had said it at the fire and it had gone by. People here measure themselves. They don't measure the place.

Ellis sat with the stone in his hand and the watch on his knee and understood, fully, for the first time, what kind of place he was standing in. Not a stronger Earth. A different number, wearing Earth's grass.

Something moved in him then, and this time it was not faint and he did not have to wait to find out where. It was the same place that had moved on the walk back from the trees, and it moved the way a door moves when the swollen part finally clears the frame.

What it bought him was small, and it was his.

He stood up from the flat spot, and for the first time in six days his body did not overshoot. He had not adapted — Kai had adapted by the second morning, the athletes had all recalibrated the way athletes do, invisibly, in the joints. This was different. Ellis knew the number now, and his body had apparently been told. He walked to the water containers and picked one up, and the weight of it was not a surprise to be corrected mid-lift. It was exactly what it was going to be.

"Throw it," he said, and Kai, who no longer asked which it or why, tossed the stone underhand across the fire light. A lazy, dropping arc, in gravity that had been fooling everyone for six days.

Ellis put his hand where the stone was going to be, and the stone arrived in it.

Kai looked at him for a moment. "Six days you couldn't do that."

"Six days I was guessing with the wrong number."

It was not power. Kai proved that thirty seconds later without meaning to, crossing to the fire over a root as tall as a fence — one hand down and gone over it. Ellis could not have done it with a year of practice and every right number there was. The order of the camp had not changed. Every athlete in it was still an athlete.

But their bodies knew this world as an ear knows a song, and would have to learn the next one from nothing, the same way, in the joints, over days.

Ellis had learned it as a number. Numbers travel.

He walked out to the graves before turning in, because it seemed like the kind of thing that should be reported to somebody.

The thirteen mounds sat in a row at the edge of the field, dark against the pale grass, under a sky holding its deep blue the way it now had a reason to. He stood in front of the newest one with his hands in his pockets.

"Twenty-five hours," he said. "A little over. You were right about that too."

He told her the rest of it plainly, over-coffee plain. The string, the stone, the quarter that should not have been there. What it meant about the trees and the animals and the sky and every knee in the camp. It took about two minutes. It was the first time anyone had said all of it out loud on this world, and the audience was grass.

The watch he kept. He wound it standing there, seventeen turns, and decided he would keep winding it, every day, for as long as this went on. However many worlds there were going to be, each would have a day of some other length. Somebody was going to have to be the one to measure it.

On the way back to the fires he stopped and looked at the tree line, black against the not-black sky.

For the first time since the field, the trees looked the right size.