The second Anu changed the design of the door before the door existed.
Until then, Lan Jue had treated the problem as one of distance. Establish the correct relation, stabilize the far side, create a response, hold the path long enough for communication.
The two Anus made distance insufficient.
"The plates agree on one thing," Lan Jue said. "A person can be related to more than one reachable place."
They were standing in the mill because the old waterwheel had become part laboratory, part public argument and part hostage negotiation with Old Meng.
Old Meng had agreed to let them use the flywheel only after Ren Yu built a bypass that would keep the grain sifters running if the experiment failed. He inspected the new assembly every morning and found a different reason to distrust it.
Today he disliked the bolts.
"They are straight."
Ren Yu stared at him. "That is usually desirable."
"Straight bolts encourage confidence."
"What kind of bolts do you prefer?"
"Bolts that make a man check them twice."
Ren Yu turned to Tianhui. "Is this an old cultivation principle?"
"No. I think he is difficult by training."
Old Meng heard and seemed pleased.
Lan Jue tapped the table. "The far side cannot be defined by a person alone. Our measurements require three independent anchors: person, place and present choice."
Tianhui studied the plate angles. "Every test also privileges this side as the destination."
"That is an assumption, not a measurement."
"Exactly. The road did not make it. We did."
Lan Jue added a fourth line to the page. "Then we remove it from the next model."
The work took four days.
Those days were not empty.
The northern road remained quiet, which made Shen Qing more suspicious rather than less. The black disk stayed sealed inside a clay jar surrounded by three empty survey plates. Nobody had discovered what it did. Tianhui recognized the grave mark but not the material.
Keshi continued answering both Anu signals with different patterns.
Pei Chao did not return.
Samar Vey's deadline approached.
The district sent another request for information, this one with a seal indicating that someone higher than Luo Dain had begun reading the unanswered reports.
And Tianhui trained.
His channel had survived the Anu collapse, though Luo Pei called that survival "a narrow interpretation of success." The route still carried qi. It also seized if he tried to sustain too much correction at once.
Lan Jue changed the exercise.
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"No duration target today."
Tianhui frowned. "Then what am I measuring?"
"Recovery."
"That is less satisfying."
"Your body is not required to entertain you."
She had him circulate until the channel warmed, stop before pain, then measure how quickly the route returned to baseline. At first it took twelve minutes. By the third day, eight.
Tianhui disliked the exercise because improvement could not be displayed in a single number anyone would admire.
He did it anyway.
On the fourth morning, he completed one hundred circulation cycles without losing the route.
He expected triumph.
What he felt was quieter.
The channel no longer seemed borrowed from an emergency. It belonged to his body.
Lan Jue checked the rings twice.
"Stable."
Tianhui waited.
She packed away the instruments.
"That is all?"
"That is the result."
"You usually add something discouraging."
"I am trying to become less predictable."
He laughed.
The door test began that afternoon.
They chose the courtyard beside the old well rather than the shrine. Too many families had begun treating the shrine as both waiting room and court. Xiulan wanted the experiment somewhere people could observe without standing on the graves of their own questions.
The near side used:
Lin Xue's hairpin.
Fu Lan's spoon.
A strip from her husband's winter coat.
The far side had prepared three objects of its own during the previous contact: a repaired basket handle, a length of red thread, and a piece of roof tile from Xue's current house.
Present choice required something neither side had prepared in advance.
Qiao Rui solved that problem by accident.
She drew a fish on the near-side response board because she was bored.
On the far side, one of the children saw it through the voice contact and drew a larger fish with teeth.
The relation strengthened.
Lan Jue stared at the plates.
Qiao Rui said, "Mine is better."
The far-side child shouted that hers could eat Qiao Rui's.
"Impossible. It has bad legs."
"Fish do not need legs!"
The contact steadied further.
Tianhui closed his eyes and felt the structure settle.
Person. Place. Present choice.
Not memory alone.
Something happening now.
"Keep them arguing," he said.
Qiao Rui looked delighted. Qiao Ming looked resigned.
The mill wheel turned.
Ren Yu engaged the bypass.
Lan Jue opened the plates.
Tianhui fed a thin current through his living channel.
The road formed.
No one saw another village at first.
The air above the courtyard thickened like heat over stone. The hairpin became cold. The red thread lifted on the far-side plate, visible only as a trembling line of color.
Then a window opened.
Small.
No wider than a serving tray.
Through it, Xue's face appeared.
Her husband stopped breathing.
"Don't," she said.
He inhaled so sharply several people laughed from relief.
The window held.
Lan Jue's hands remained steady over the plates.
"Tianhui?"
"Stable enough."
"How stable?" Shen Qing asked.
"Do not lean on it."
"That was not my plan."
"Good."
They spoke for six minutes.
Nothing dramatic happened.
That was what made the six minutes extraordinary.
Xue complained about a leak in the false village's western storehouse. Her husband told her real Hejingshui had three leaks and therefore remained superior. Fu Lan demanded her spoon back. Xue said she had finally found a use for it.
"What use?" Fu Lan asked.
"Annoying you."
Fu Lan nodded. "Acceptable."
Then they tested matter.
A piece of string went first.
It crossed from Xue's fingers into a small clay bowl beneath the window.
Nobody touched it for ten seconds.
Lan Jue examined it.
"Same material."
"Same object?" Xiulan asked.
"I can tell you it has the same fibers."
"That is not the same question."
"I know."
The second object was the spoon.
Fu Lan had insisted.
Xue pushed the handle through the window.
For one second the spoon existed on both sides of the relation: one end in another Hejingshui, one end above the old well.
Then the whole object came through.
It fell into Fu Lan's waiting hand.
She turned it over.
There was a new burn mark on the handle.
Xue said, "That happened here."
Fu Lan ran one thumb over the blackened wood.
"Then keep better watch over my property next time."
Her voice was rough.
Nobody commented.
The door remained open another ninety seconds.
Then the north plate flashed.
Shen Qing moved before anyone else. "Close."
Lan Jue began the sequence.
On the far side, Xue turned toward the northern trees.
A bell rang once.
The window trembled.
Tianhui felt another relation touch the edge of the door.
Unknown.
Waiting.
He did not investigate.
He cut his current on Lan Jue's count.
The window closed.
The spoon remained in Fu Lan's hand.
For several minutes the village stood around an ordinary wooden spoon as if it had crossed a sea no map contained.
Then Old Meng asked whether the experiment had damaged his mill.
Ren Yu checked.
"It is fine."
Old Meng grunted. "Then perhaps you can build the next impossible thing after harvest."
No one promised him that.