The eighth access point was in a market town.
This presented logistical complications that the previous seven had not, since those had all been located in places where human habitation was sparse enough that arrival, documentation, and departure could be accomplished without drawing significant attention to what they were doing.
The eighth point was underneath a dyer's workshop in the eastern quarter of Chenling, a town of approximately four thousand people who had spent the better part of three generations building a commercial reputation around indigo cloth. The workshop had been in the same family for most of that time. The current owner was a woman named Huo Yanmei who was sixty-three years old and had strong opinions about everything.
She had stronger opinions than usual about three strangers appearing at her door before the morning work had begun, claiming they needed to examine her floor.
"My floor," she said, looking at them with the expression of someone who had encountered considerable nonsense in sixty-three years and recognized this as more of it.
"Specifically the northeastern corner," Cao Renfeng said. He had taken the role of initial explanation by unspoken consensus, having demonstrated across multiple access points that he could describe unusual requests in ways that made them sound administrative rather than alarming. "We're conducting a survey of geographical features for the eastern valley institution."
"The institution that appeared overnight on the Lianhe hillside two seasons ago."
"That's the one."
Huo Yanmei looked at him. Then she looked at Shao Peng, who was carrying measurement equipment and looked appropriately official. Then she looked at Hungan.
"How old are you," she said.
"Fourteen," Hungan said.
"You're the one they talk about," she said. It was not a question. Information about Hungan had spread across the region in the way that information about unusual things always spread — imprecisely but persistently. Most accounts described him inaccurately. Most accounts also captured something essentially true, which was that he was not a normal fourteen-year-old, and that things happened differently in places where he was present.
"Probably," Hungan said.
She looked at him for another moment. Then she stood back from the door.
"The northeastern corner has always made my dyes run strange," she said. "Not badly. Just differently than they should. Blues come out with a quality that buyers pay extra for without being able to explain why." She led them through the workshop, past vats of indigo and rows of cloth in various stages of treatment, to a corner of the floor where the stone was slightly darker than the surrounding area. "I assumed it was something about the mineral content of the water that pools here in the rainy season. I see now that was perhaps not the complete explanation."
Cao Renfeng crouched and examined the floor with the careful attention he gave to all access points. "How long has the dye run differently here?"
"Since my grandmother's time. She noted it in her work records. She also noted that cloth dyed in this corner was more expensive to produce and sold for more, and that this was good arithmetic and required no further investigation." Huo Yanmei crossed her arms. "I have maintained the same position."
Despite himself, Shao Peng smiled.
Hungan walked to the corner and stood in it.
The access point was smaller than the previous seven — not in the aperture itself, which maintained the same perpendicular relationship to the main world layer that all Vessel boundaries did, but in the zone of influence around it. The previous points had been perceptible from several paces away. This one concentrated almost entirely in the single corner, as though the boundary had been compressed by the weight of the building above it and the decades of activity around it.
It was also, Hungan noticed, the only access point so far that had something in it.
Not the signal from beyond the planet — that had been specific to the seventh point and he had not expected it to follow. Something else. A residue of use. Someone had moved through this access point deliberately and not so long ago — not within living memory, but within the memory of the Vessel itself, which maintained a different sense of time than human recollection did.
"Someone used this," he said.
Shao Peng looked up from his measurements. "Used it how?"
"Passed through. Into the Vessel space and back out." Hungan looked at the residue more carefully. The frequency was not familiar to him but it had a quality — purposeful, careful, slightly constrained, like someone who knew what they were doing but was doing it in a hurry. "Not an accident. They knew where they were going."
"He Daomin's records note that Vessels were used deliberately before the mapping project," Cao Renfeng said, writing steadily. "There are historical accounts of practitioners entering Vessel space for various purposes. The practice fell out of use when the theoretical framework for understanding Vessels was lost during the third revision of cultivation doctrine."
"When was that?"
"Approximately two hundred years ago." Cao Renfeng paused. "The residue you're sensing — could it be older than that?"
Hungan considered. "No. More recent."
Huo Yanmei, who had been listening from a polite distance, said, "My grandmother mentioned a traveler. Once. She wrote about it in her work records as a marginal note — a practitioner of unusual capability who stayed two nights and paid for lodging by mending ironwork around the workshop. She noted that the dye corner ran differently after he left than it had before he arrived. She assumed he had adjusted something." A pause. "She did not explain further and the record doesn't indicate she asked him."
"What was his name?" Hungan asked.
"She didn't write it. She wrote that he declined to give one and that she respected this because she also had information she preferred not to write down." Huo Yanmei's tone carried the faint approval of one pragmatist acknowledging another across the distance of generations. "She noted that he came from the direction of the coast and left toward the mountains and seemed to know exactly where he was going."
Hungan looked at the residue in the access point for a long moment.
Someone two hundred years ago, moving through Vessel space on purpose, passing through a market town in the eastern region, paying for lodging with labor instead of identity, heading toward the mountains with certainty.
"Cao Renfeng," he said.
"Recording," Cao Renfeng confirmed, without looking up.
"Cross-reference this when we reach the institution. I want to know if any other access points carry similar residue from roughly the same period. Someone with this frequency and this level of deliberate movement wasn't visiting one point. They were mapping."
Shao Peng had gone still in the way he did when a piece of information rearranged something fundamental. "Someone else was mapping before us."
"Someone else was mapping before the mapping project," Hungan said. "Before the theoretical framework was lost. They might be the reason it was lost — if this person was moving through Vessel space outside the established practice, and the established practice got revised into doctrine that excluded what they were doing—" He stopped.
"Their knowledge would have been excluded with it," Shao Peng finished. "And if they documented what they found—"
"That documentation is somewhere," Hungan said. "And it's not in any archive Archivist Pei has found yet, because Pei would have mentioned it immediately."
Huo Yanmei had been following this exchange. "You're saying someone mapped these places two hundred years ago and the record was lost."
"I'm saying someone was moving through these places deliberately and I'd like to know why," Hungan said. He looked at her. "The dye in this corner. The quality buyers pay extra for without explaining why. What does it look like?"
She went to a rack near the corner and removed a length of finished cloth. She held it toward the light coming through the high workshop windows.
The blue was ordinary indigo in most of its depth. But at certain angles, and in certain qualities of light, it held something that was not quite a second color — more like the memory of one. A depth that made the cloth seem briefly like it was showing you something slightly further away than the surface of the fabric.
Shao Peng exhaled slowly.
Cao Renfeng looked up from his documentation cloth for the first time since they had entered the workshop.
"The Vessel boundary affects the dye process," Mage said quietly, at Hungan's left shoulder. "The cloth absorbs not just the indigo but the quality of the space. Perpendicular to the world layer. It holds a small amount of the between."
Huo Yanmei looked toward the source of the voice and found no visible speaker, which she received with the same measured expression she had given everything else this morning.
"This explains," she said, "why no other dyer in Chenling has been able to reproduce the effect despite using identical indigo from the same source." A pause. "I will not be sharing this information with competitors."
"That seems reasonable," Cao Renfeng said, making a note.
Hungan bought two lengths of the cloth before they left. He did not explain why to Shao Peng or Cao Renfeng, and neither of them asked. They had learned that Hungan's unexplained decisions usually became clear eventually, and that pressing for explanation before he was ready to give it produced nothing useful.
He thought the cloth might be important later.
He thought the unnamed traveler who had moved through this point two hundred years ago might be more important still.
He thought about the signal at the seventh point, patient and ancient, asking its question into the dark.
He thought about his mother, who had known what she was for.
Mage walked at his left shoulder as they left Chenling behind and turned toward the ninth access point, and did not speak, and the silence was the particular kind that meant Mage was also thinking — which meant that whatever Hungan had found in the eighth point was the kind of thing that warranted both of them thinking about it separately before they compared conclusions.
The mountains were ahead.
Somewhere in them, the unnamed traveler had walked two hundred years ago with the same certainty the signal had — the certainty of someone who knew exactly where they were going and why.
Hungan intended to find out.