"A scar across a Riemannian manifold cannot heal without a record of the original curvature. The observer does not command the geometry; the observer reminds it of its rest state."
From MECN-7 Architectural Core: Principles of Metric Rebinding, McGill University Press, 2128
"If it shears another three micro-radians," said, "the ship won't be crushed, . It will just stop being simultaneous."
"Which part of the ship?" said .
"Whichever part is thinking about it."
knew what meant. One hair more of twist and the front of the ship would be living a moment ahead of the back. The Aletheia hung two hundred metres off the wall of torn space around the island, nose pointed at it, and already the deck would not sit still under his boots. It slid a couple of millimetres out of step with him and slid back, so that his inner ear arrived at every moment a fraction after his eyes did. Through the canopy the wall showed as nothing at all, a region where the stars were slightly wrong. Beyond it, small and very bright, was the knot of calm space where the Kepler's drive core had been holding a door open for eight years. The board said fourteen hours and nine minutes to the inversion. The Stability Index outside said 0.09.
"Wanxing," said. "Are we drifting?"
"Barely." Su did not look up. She was in the left seat with her feet hooked under the pedals and her ribbon tied round her wrist, and she was giving the top thrusters a short puff of cold gas every six seconds by hand, because she had stopped trusting the computer an hour ago. "She wants to slide into the throat, Colonel. The whole bay leans downhill. We have two hundred metres of clearance, and I am keeping every single metre."
"Keep us on the tooth," said.
had laid the plan out once, at the console, in the voice he used for students who were frightened, and nobody had interrupted him. Under the Halo, under all space, lay the honeycomb grid he had drawn on a whiteboard in Longwan, and around the island that grid was torn and crooked. The lanterns would fly out and map it. When sang, her voice made the same honeycomb on a screen, clean and whole. would carry her song up from Tianmen through the Anchor Relay, his special radio that spoke along the grid itself, and lay it over the torn one like a pattern laid over cloth. And someone would cross two hundred metres of broken space to the drive core, wait for the pattern to take, and turn Kwesi Osei's key, so that the old engine could finally die and let the door close.
He had said that last part without looking at anyone. Then he had unclipped and gone back to the cargo bay.
Atlas-0 hung in its cradle in the cargo bay with its chest open. was already in it.
She was in her pressure suit with the helmet still racked, wedged into a cockpit that had been cut for a narrower man, and was on the shoulder plate with a driver in her teeth, letting the collar out another notch. The suit looked the way it had in the foundry at Longwan with sparks coming down on it: grey composite, gold seams, the crossed halberds of Unit Nine on the shoulder, and the right leg still a shade newer than the left where they had rebuilt it after the stadium. 's third relay was strapped into its back in a cage of copper tape, built round the crystal Bo Han had taken off the Longwan base siren.
"It's cut to me," said.
" let the collar out at Tianmen," said. "Four centimetres."
"At Tianmen."
"You were in the centrifuge."
He looked at . took the driver out of her mouth. "She asked me to," she said. "She asked me in your bay in Longwan, the day you promised her this thing would never leave it. I said it was cut to your size. She said she had noticed."
"I walked it through the Citizen's Hall," said to . "I know how it pulls left on the hip. I know what the cockpit does to the knees when space starts to slide. I built it so somebody would not have to hang out there alone. I built it for this."
"I know what you built it for."
"Then let me use it."
"Her spine was built for bent space," said. "She is Warborn. Yours wasn't. That is the whole argument, . I can draw it for you if you want."
pulled the cockpit's chest plate down by its handle until it sealed, and looked at him over the rim. Her face was very calm.
"You built the model," she said. "I am the one who holds things."
He started to answer and found that he had nothing that was true. She was right about her spine and right about the wall. He looked at her inside the suit he had drawn on drafting film in a Montreal winter, and he made himself stop.
"You promised me once this suit would not leave the bay," said. "I am taking it out. That makes us even."
He checked her tether himself. He ran the line through his gloves from the winch to the clip on Atlas-0's spine, found nothing wrong with it, and clipped it again.
"The wall loops," he said. "That's what stopped . She walked into it and her legs kept arriving back where they'd started. But it repeats, and the lanterns can see the rhythm. You step when I tell you, and not before."
"Then say it clearly," said, and closed the helmet over her.
On the flight deck, Mara Voss was locking out the weapons console with lead wire.
"Tubes are clear," she said, when pulled himself back to his station. "Missile magazines vented to space. If we lose the rim, we don't shatter the Moon into shrapnel on the way down." She twisted the wire shut with a pair of pliers. "We go down with the whole library open."
's notebook was open on his console to the first blank page, held there under an elastic strap, the pages lifting at the corners in the slow draught from the scrubbers. Voss looked at it. She reached into her breast pocket and took out the scarred steel cylinder she had put in front of him in the simulator bay at Tianmen, Kwesi Osei's fuse, and set it on the open page. The corners lay flat.
"He said to use it to hold down the logbook," Voss said, and went back to the cradle behind Su.
was on the main screen. The camera on the ground-station roof at Tianmen looked up at her from below, so that behind her there was only the great white dish, pointed straight up, and the night sky with the cloud torn open above it. The wind off the South China Sea was pulling her hair across her face. She caught it back behind one ear. Her mother's two small gold coins had swung out of her collar on their chain. She had been awake for as long as they had, and it showed under her eyes, and nowhere else.
"," said.
A second and a quarter later she looked into the lens. "I'm here."
"It will feel like shouting into a gale at first. Don't push against it. It isn't trying to drown you. It has only never known how to be quiet."
The delay ran out. A little of the stage smile came and went. "I grew up in the lower district after the sea walls broke," she said. "I know what noise is, ."
had pulled herself across the deck and put her palm flat against the monitor, over 's shoulder, to keep the wind off her. She had not slept either. Her fringe hung in her eyes.
"," she said. "You stay inside my voice. Do not look past the lanterns."
"I will not," said, small and clear, from three hundred and eighty thousand kilometres down.
"Lanterns," said.
struck the release with the heel of her hand, and the hundred lanterns went out from the hull.
They spread like seed thrown on hard ground, small gold points against the violet, until they were scattered across forty kilometres of dark. They did not keep formation. They could not. The broken space took each of them and threw it along whatever line it allowed. In the round display in the middle of the deck, each lantern left a glowing thread behind it, and the threads crossed, and where they crossed they drew cells. The grid drew itself line by line around the island: a honeycomb, torn and crooked, like one somebody had stepped on.
"Twenty are getting thrown about on the inside edge," said. "I can barely hear them."
"Don't fight the shear," said. "Let them tumble. We don't need where they are. We need the distance between them. Let them measure each other's drift."
"They are going to burn their attitude coils, ."
"We won't need the coils after this."
"They're finding the corners." 's face was lit gold by the display. "Look at the tracks. Where the threads meet, the space underneath is flat. They're catching the zero points. Oh, that's lovely. That's so lovely, it's going to kill us."
"Relay's live," said. His voice had gone hoarse. "The signal's filthy down the pipe, , it sounds like an iron bridge collapsing down an elevator shaft in reverse, every bolt screaming on the way up. But the link is alive. And the relay on the Colonel's back is joined to it. Wherever the Colonel walks, the singer walks with her."
"," said. "Go."
He watched her three ways at once: her helmet camera on his left screen, the pull on her tether in the corner of Su's board, and the canopy, where after a minute a small figure in grey came out from under the ship's belly and began to cross toward the island with a line paying out behind it.
At a hundred metres the tether was steady and her breathing on the feed was even. At a hundred and forty she reached the wall.
The helmet camera showed it as a faint crease in the stars ahead of her, and then the picture jumped. Atlas-0's right boot came down on nothing. The picture jumped again and the boot came down on the same nothing, at the same angle, with the same small bloom of frost from the sole vent. watched it come down a third time and felt the bottom drop out of his stomach.
"I'm not moving," said. Her voice was perfectly level. "I'm taking a step and I'm not moving."
"Breakfast," said quietly, and nobody laughed.
had the wall on the lantern display before finished the sentence. It was a loop, as had said: a fold in time that caught anything walking into it and put it back where it had come in, over and over. But nothing in the Halo was perfect. The loop breathed. Every four seconds, as it reset, its edge went thin for a moment, and in that moment the space ahead of her was ordinary space you could walk into.
". Stop stepping."
The picture held still. On the lantern display the wall went on breathing.
"There's a gap every four seconds. It's narrow. When I say now, you put the gauntlet into the wall and step through behind it. Not on now. On the word."
"Understood."
He watched the gap come round on his screen. He had been here before, on a painted line in Xinhe with on the other side of a cordon, waiting for a number to turn into a fact, and he had been ready to die if he was wrong. This was worse. It was not his body on the line.
"Three," he said. "Two. Now."
Through the canopy he saw it: a hard violet flare on Atlas-0's left arm as the gauntlet bit into the wall and split it, a star coming on out there in the dark. The picture lurched forward a metre and held.
"Through one," said.
"Again. Three. Two. Now."
It took nine of them. Each time the gauntlet flared, and each time the pull on the tether jumped, and Su took the load on the ship with two touches of gas so the line did not snap or go slack. On the seventh the flare came up white at its centre, and on 's suit readings a temperature began climbing that did not let himself look at twice. On the ninth the picture went forward and kept going, and the stars on 's helmet camera came round and steadied.
"I'm on the island," said. "It's quiet here."
The helmet camera swung down. There was the Kepler's drive core, a scorched cylinder twice her height, its casing split along one side. Through the split ran a line of white light so thin it seemed to have no width at all, the needle had shown them, running away into the dark at three-four-eight by minus twelve. Beside the split was the scuttle panel. The cover had been blown off. The key was in its lock, red lanyard floating, turned to SAFE.
"I have the key," said. "The frame's fingers won't fit it."
"Can you open the left arm?"
There was a pause. On the canopy the violet star dimmed, and on the camera saw the frame's armoured forearm hinge open and 's own arm come out of it, in her pressure glove, with the gauntlet strapped over the glove and its seams glowing. She closed her fingers round the key and held them there.
"Not yet," said. "When the pattern takes. On my count."
"Then start singing," said.
pulled herself to the forward quartz and pressed her right hand flat against it.
Her reflection did not stay on the glass. It spread out from her palm across the pane in branching violet frost, fine as the veins in a leaf, and her eyes went somewhere a long way past the canopy.
"It hurts," she said. "It's trying to remember what a straight line is."
"Give it the line," said.
turned her head toward 's microphone. "Now, little bird."
On the roof at Tianmen, took a breath, and the sound of it came up the link, through the ship, out along 's tether and into the island.
They had built the pattern together at Tianmen over a week of nights, and and a recording had made in Longwan with 's microphone at her throat. It was The Snow Still Falls, the song she had sung for him at Moonveil and for three governments in Geneva, taken apart note by note and lined up against the grid the lanterns would draw. On paper it had looked like nothing but proportions. Now she sang it without the words, each note held long enough for the lanterns to find it. Under the long held notes could still hear the tune. The snow still falls upon the stones. He had not expected to be able to hear it.
In the display a second honeycomb appeared, made of her voice, gold and clean, and settled over the torn one. Outside, the violet around the island deepened toward the colour of deep water. The crooked cells in the display began, very slightly, to straighten toward hers.
"It's rejecting the fifth harmonic," said. "One of the notes is too sharp, Min-ji. It won't take it. It's cutting through the line."
An arc of blue static jumped out of the relay casing and threw back against his bench. He swore in Polish, pulled himself back and put both bare hands on the connector where the line was breaking, and held it together. smelled skin burning and saw that was not going to let go.
"Link's alive," said through his teeth. ". Whatever you're going to do, do it now."
looked at the display. For a moment the song's honeycomb lay over the torn one and the two nearly matched. Then the thing at the centre pulled the song in, the way it pulled in everything that came near: the bridge, the transport wing, the Kepler, walking toward a key and arriving back at breakfast. The song went in, its shape came apart inside it, and the torn edges in the display opened again.
He had brought it a shape, and it had swallowed ten thousand shapes before this one. For years it had eaten clocks and radar and the last minute of every ship that came too close, and none of it had stayed, because it had nothing to hold them against. A broken bone sets straight only if it can be set against a straight one. The song showed it what straight looked like, for four lines. It could not show it where straight had been. had asked for a rule that stays true, and a rule is a shape that is still there after it has been tested a thousand times. The thing in the Halo had no such memory. It had never held still long enough to know what calm was, so it had nothing to come back to.
The record of calm was on the drive at his elbow. Eight years of it.
"It needs the memory," he said.
"." Voss had leaned forward in the cradle. "If you dump the whole archive down that line you could burn out the core."
"It's been eating our clocks since before the Kepler," said. "It wants to know where we have been."
He opened MECN-7's archive and gave it all of it.
Eight years of the world disagreeing with itself went out along the line under 's voice: the sensors under Longwan, listening to space rise and fall like a tide through thirty metres of harbour mud; the quartz clocks in the basement at McGill, counting their tiny drift through the winter nights while he slept on the floor beside them; the New Mexico desert and the Xinhe boulevard and the stadium at 0.982. At the bottom of it was the oldest file, the Kepler's last scrambled readings, which he had carried out of the escape module in the pocket of his flight suit and never once let anyone take from him. It was a fossil record of an earth that had refused to stay smooth: every tremor, and every ordinary day in between when nothing moved at all. On the screen the numbers did not look like an enemy. They looked like an argument.
In the display the archive went out as a long pale thread under the gold of the song, and where it touched the torn cells, they stopped pulling away.
Here is the time we kept, he thought, and did not finish the thought, because made a sound.
A thread of blood had come out of her left nostril. It was violet, faintly glowing, and it drifted off her lip in small beads. Her hand had gone grey where it pressed the glass.
"It's seeing it," she said. "It sees the ground. , it sees the ground."
On the main screen, three hundred and eighty thousand kilometres down, 's eyes were closed and her arms had come a little away from her sides, the way a person balances on a rail. She came to the end of the first line and went into the second.
The fire is low, the kettle cold.
knew that line. He had heard it a hundred times through a bulkhead on the Kepler, sung by a woman cleaning optical relays with a lint-free rag, who missed the minor third every single time and laughed about it. He watched that note come up on his screen, the one could never reach, and he watched the grid in the display lean toward it.
"," he said. "On that note. Three. Two. Now."
hit it true.
On the island, turned the key.
The gauntlet on her forearm flared once, so bright that the canopy dimmed itself, a violet star at the exact centre of the Halo, and then it went out. The helmet camera went white and dropped to black. On the lantern display the needle of white light inside the Kepler's core shortened, thinned, and folded into itself. The old drive finished, eight years late, the collapse it had started on the morning the Kepler died, and the door it had been holding open swung shut.
"Wanxing," said.
"Gas off." Su's voice cracked and kept going. "She's not sliding anymore, . The bay's flattening out. The hill is gone."
Outside, the lanterns had stopped tumbling. They had found their places, and they hung in nested rings around the island and out across forty kilometres of dark, joined by their threads of light, showing it where the floor was. In the display the torn edges met and lay down against each other, crooked cells against straight ones, until the honeycomb was whole.
"Stability Index," said. "Zero point four zero. Point six two." Her voice went up. "Point eight five."
The Halo was changing colour. The violet was going out of it from the inside, and what was left was a clean, luminous ring of pale silver light, circling the Moon like an ice halo over Montreal on a clear winter night.
"," said.
Nothing on the camera. On Su's board the tether pull read zero.
"."
"Tether's slack," Su said. "There's no tension on the line. , there's nothing on the line."
held on to the console. He did not count anything. He watched the place on the canopy where the star had been, and it stayed dark.
The tether reading flickered. It went to twelve kilograms and held.
"Gauntlet's gone." 's voice came in without the camera, flat and a little breathless. "Camera's gone. Frame's good. Reel me in, Wanxing. Slowly."
breathed out, all the way, the way Bo Han had taught him on the ghost path, and drew a new one.
He was at the inner airlock door when the cycle finished. He did not remember going there. The light over the hatch went from red to amber to green, and the door slid back, and Atlas-0 came through it sideways, slowly, with frost smoking off its plates. The left arm of the frame hung open on its hinge. 's own forearm lay across her chest, and the gauntlet strapped over her glove was black, its casing split along the seams where the violet had run.
She opened the chest plate and looked at him.
"You can let go of the door now, ," she said.
He looked down. His hand was still on the release handle. He took it off.
"All of them?" said.
"All of them," said.
came forward to the canopy with him, holding her burned arm against her ribs.
Out at the lower edge of the ring, where the silver arc lay against the grey plains of Oceanus Procellarum, the light bunched and settled, and someone was standing in it.
She hung two hundred metres off the bow in the white-and-grey suit, the visor clear under the earthlight. Her hair had come loose from the tape and drifted round her head, as it had on the morning they ran the pressure tests on the Kepler's life-support loop and she had laughed at him through the glass for checking every seal twice. She looked straight at him across the dark.
Her lips moved. 's microphones caught nothing.
You see? read. It wasn't random.
The corner of her mouth went up, crooked, the grin that meant she had been right and was going to be insufferable about it. Then she took one step backward into the drift and went into the ring, the lines of her suit softening into light, and then into the curve itself, until there was only the cold, clean silver and the stars.
"Was that her?" said.
did not answer, and she did not ask again.
Behind them, had pulled his headset off and let it float. He put his face into his palms, carefully, because the palms were burned, and his shoulders shook twice and then were still. had folded down onto the grating with her feet hooked under the rail and her head against the bulkhead, the violet draining out of her skin, listening to breathe over the speakers. Su took her hands off the controls one finger at a time and watched the three drift needles on her screen settle at zero.
"We're in orbit," she said. "We're just... in orbit. Like an ordinary ship."
"Is it finished?" said.
looked at the board. The Stability Index read 0.998, and the third decimal did not move.
"No," he said. "It's not finished. But the ground is firm."
Voss came forward from the cradle with the lead wire still wound round two fingers. She picked Kwesi's fuse up off 's notebook and turned it over, and put it back.
"Neumann," she said. "Command's going to ask whether we can use this on the ruptures back home. The Midwest. The Channel."
"We can't close them," said. "We never could. We can only teach them how to stay where they belong."
gave a laugh that cracked down the middle. "Do you understand what this means for the textbooks? All of it has to be rewritten. It's not an instability, . It's an ecology. It was always an ecology."
"Do not write the paper today, Hoshino," said. " needs a medic."
"I'm fine, Colonel," said into his hands. "The professor can write whatever he wants. Just tell me someone packed Bo Han's dried pork."
came across the deck with a charred circuit card from the lantern cradle, its resin blistered black and its traces pooled along one edge like solder left on a hot iron. She held it out to on her open palm.
"Eighty-four survived," she said. "Sixteen burned their coils on the last pulse. The rest are holding the ring. We don't need to bring them back. We couldn't if we tried."
He took the card. It was still warm through his gloves.
"You built them well," he said.
"We built them well. You give yourself too much credit for the maths, ." She pushed off back toward her station. "The soldering is what keeps the sky up."
"The soldering is very important," said.
On the main screen the camera on the roof at Tianmen had tipped over in the wind and now showed the dish, the clouds, and a corner of 's coat. Her voice came up a second and a quarter late.
"? Did it hear us?"
"Yes," he said.
She was quiet for a while. Then she began to hum, not the long held notes but the tune itself, slow and plain, the way it was sung in shelters. On the grating lifted her head and came in under her, a rough, low harmony with no polish on it at all, and missed a note, and kept going.
rested his forehead against the cold quartz. Through the pocket of his flight suit he felt the old coin lying against his ribs, and for once he left it where it was.
"," he murmured.