The next morning, Hejingshui discovered that a door between realities could become ordinary faster than anyone expected.
People still came early.
They still washed before approaching the courtyard. Some brought offerings despite Xiulan's repeated explanation that the formation was not a shrine. Others brought objects they wanted sent across: letters, bracelets, clothing, a child's carved horse, a packet of dried tea.
Most were refused.
The door had carried string and a spoon. That did not make it a post office.
Fu Lan disagreed with the metaphor on practical grounds.
"A post office loses fewer spoons."
Luo Dain, who had once worked three weeks in a district records hall, said this was not guaranteed.
The first opening of the day belonged to Lin Xue.
Xiulan had insisted on that before the village began dividing access by urgency, grief, seniority, or volume of shouting. They still had not agreed on a general rule. For now, an existing stable relation took priority because every successful opening taught them something that might help the others.
This explanation satisfied almost nobody.
Xiulan considered that evidence it might be fair.
The window opened wider than the previous day.
Not wide enough for a person.
Wide enough for two people to sit across from each other without raising their voices.
Lin Xue's husband brought breakfast.
He placed a bowl of millet on the stone below the opening. Xue held up her own bowl from the other side.
"They still cook it badly here," she said.
"Then it is definitely Hejingshui."
"Your mother made this."
He lowered his spoon. "I withdraw my claim."
The conversation wandered.
That was the point.
They discussed a leaking roof, a missing mule, whether the false village's plum tree had flowered in the wrong season and why Xue's husband had still not repaired the cupboard hinge she had complained about before the rupture.
"Because you were not here to complain every morning."
"I am complaining now."
"Yes." He smiled into his bowl. "It helps."
At the edge of the courtyard, Tianhui sat with Lan Jue and tried not to touch the formation.
The door no longer required his full attention. That should have pleased him.
It did, in the abstract.
In practice, every small fluctuation made his hand move toward the nearest plate.
Lan Jue slapped the back of it with a reed stick.
"You agreed to observe."
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"I was observing an instability."
"You were preparing to interfere."
"The distinction can be brief."
"That is why I have the stick."
Tianhui folded his hands in his lap.
Ren Yu corrected the first pulse by adjusting the mill load.
Lan Jue corrected the second by changing the angle of the far-side response plate.
The third vanished on its own.
Tianhui disliked that most.
Xiulan sat beside him.
"You want it to need you."
He almost denied it.
Then he remembered how many times denial had been the first step toward a more embarrassing truth.
"A little."
"Why?"
Tianhui watched the door.
For three thousand years, survival had meant preserving the one mind he could trust. The chamber had reduced the universe until his own awareness became the only instrument available. Building something that continued when he stepped away felt, at a level he did not respect, like surrendering control of his own heartbeat.
"I am accustomed to being necessary," he said.
Xiulan rubbed charcoal from one thumbnail. "That sounds tiring."
"It was."
"Then practice being less useful."
"That sounds worse."
She left him to consider it.
The door remained open for nineteen minutes.
During the fifteenth, the located Anu arrived on the far side.
Keshi was waiting.
Neither child spoke at first.
Then Keshi held up half a pear.
Anu shouted, "That is mine."
"You owe me half."
"For what?"
"The mill weight."
"I carried more."
"You put your side on the wall."
"The wall was helping."
The argument continued for four minutes.
Adults quietly moved farther away.
When the pear was eventually pushed through the door, it arrived with one bite missing.
Keshi stared at it.
Anu grinned from the far side.
"You still owe me."
He ate the rest while crying.
No one told him to stop.
Later, when the courtyard had emptied, Xue remained at the opening with Xiulan.
"People keep asking when I am coming back," she said.
Xiulan did not pretend not to understand.
"What do you tell them?"
"Different things."
"Which one is true?"
Xue glanced behind herself.
A woman crossed the false lane carrying firewood and called something about dinner. A child chased a chicken past the well. Smoke rose from the western roofs.
"All of them, depending on the hour."
Xiulan rested both hands on her knees.
"When we first heard you, I thought the problem was finding the real Lin Xue."
"I noticed."
"I am sorry."
Xue considered her.
"You asked me questions about home. You asked the others questions about why they were different."
"I did. Familiarity made me careless."
"That hurt."
"I can see it now."
"No. You can name it now. I had to live through it first."
Xiulan lowered her eyes. "You are right."
For a while they listened to the mill wheel.
Then Xue said, "I want to come back."
Xiulan's chest tightened.
Xue lifted one hand before she could answer.
"I also live here."
Behind her, someone called her name from inside a house that did not exist in real Hejingshui.
She answered automatically.
Her husband, carrying empty bowls toward the courtyard, heard.
He stopped at the edge of the door.
Xue saw him.
No one rescued the moment with a joke.
He sat down on the near side.
"You have work," he said.
"So do you."
"I have been told my main work is waiting."
"You were always bad at that."
"I am trying to become less impressive."
Xue smiled.
The smile faded slowly.
"What happens if I cross?"
Tianhui answered because the question was technical and because nobody else should have been forced to pretend certainty.
"We have no reliable model for a human crossing."
"Will this place remain?"
"The door has not taught us that."
"Will the other versions of me remain?"
"We cannot measure the effect yet."
"Will I?"
Tianhui met her eyes. "We do not know enough to ask you to risk becoming our experiment."
Her husband's fingers tightened around the empty bowl, then slowly loosened.
Xue nodded.
"Then don't ask yet."
They did not.
The north bell rang near sunset.
Once.
The door was closed at the time.
Shen Qing doubled the watch anyway.
The black disk in the clay jar had become warm.
Lan Jue measured it without opening the seal.
"Temperature increase of four degrees."
"Cause?" Tianhui asked.
"Unknown."
"Relation to the bell?"
"Probable. Confidence low."
"Thank you."
Shen Qing gave him a strange glance.
"What?"
"You two make uncertainty sound like a profession."
"It is," Lan Jue said.
After dark, a voice came through the northern marker.
No copied child signal.
No bell.
A single adult voice speaking the old language.
"Buried king."
Everyone in the courtyard turned toward Tianhui.
He remained seated.
The voice continued.
"You built a door before learning who was knocking."
Shen Qing's hand settled on his sword.
Tianhui answered from where he sat.
"Then introduce yourself."
A pause.
The stranger laughed softly. "An introduction is a form of trust."
The contact ended before Tianhui could answer.
Feng Zhen's remembered voice remained silent.
Tianhui did not chase it into memory.
He went to the northern watch and stayed there until dawn.