I knocked on Bok's door at 11 AM because I could not let it accumulate overnight.
He opened it immediately. He was wearing his coat indoors, which he always does when the building's heating is inconsistent, which is always. He looked at me the way Bok looks at things that arrive unexpectedly: not surprised, not unwelcoming, just present. He made room in the doorway.
You visited relay three, he said.
Not a question. He already knew. Chae-Gyeol again.
I did, I said. I want to explain why.
I told him about the Ordinary Gradient. The first corridor session — Juyeon-ssi with her neck pain, how the gradient in a designed indifference space (my mapped corridors) was shallower than in an accidental one (the stairwell by her apartment). I told him I needed a reference case. A space whose indifference I did not design, did not choose, could not have contaminated before the study began. I told him relay three was the clearest example of what I was measuring toward — a corridor that had been indifferent for reasons entirely unrelated to me, and that I needed to understand what that looked like so I could tell whether my designed spaces were actually producing the same quality of nothing.
The control, Bok said.
Yes.
He was quiet for a moment. He was looking at a point slightly above my shoulder, which is what Bok does when he is thinking.
Do you think you changed it? he asked. By visiting?
This was the question I had been sitting with. I had gone to relay three early in the morning, before sunrise, because I told myself the building would be quieter and the acoustic properties more consistent. But I had also gone early because I did not want to be seen going. Not by Bok specifically — I had not imagined Chae-Gyeol would mention it. I had wanted to observe without being observed, which is the oldest contamination problem in the field.
I don't know, I said. That's the problem.
Bok turned back to look at me directly. This is relatively rare. He usually looks near things rather than at them.
I think you didn't, he said. The corridor doesn't know it was visited. The concrete doesn't know. The dust pattern is the dust pattern. If I went to relay three right now and sat in it, it would be indifferent to me. It's always been indifferent to me. That's not a condition I created — it's a property of the space.
I considered this. It is a position I had considered and rejected — that indifference is architectural rather than relational. That certain spaces have a structural indifference independent of the observer.
But if you started paying attention to it, I said. If you checked on it more often. If my visit made you notice it.
Then I would be changing something, Bok said. Not you.
This was the distinction he was drawing: the contamination risk was his attention, not mine. I had visited and left. Unless my visit changed his relationship to the corridor — made him curious, made him check on it — the corridor remained uncontaminated.
Is indifference a state or a trait? I asked. I had been carrying the question since I wrote it in my notes.
Bok thought about it. Outside, somewhere above us, something shifted in the building's ductwork — a low metallic sound, settling.
Trait, he said. A state can be disrupted. A trait is what it is. Relay three has been that way since the building was built. One visit doesn't reach back and change what it's been.
I left his apartment twenty minutes later uncertain whether he was right. He might be. Or he might be someone so comfortable in indifferent spaces that he cannot imagine being altered by observation, and is therefore modeling the corridor on himself.
But I realized, walking down the stairs, that the conversation had produced its own data point. Bok, informed about the Corridor Sessions protocol, told not to change anything, given the full context — had not become curious. Had not asked to see my notes. Had not suggested collaboration or altered his stated relationship to relay three.
Indifference as trait. He demonstrated it while defining it.
I wrote in my notebook at the bottom of the stairwell: Bok is his own evidence.
And then, because the stairwell by my apartment has its own gradient and I had not measured it that morning: I sat in it for seven minutes with my phone propped against the wall and the microphone recording ambient sound, watching my own body settle into a space I had designed to produce exactly this — the particular quality of not being required to do anything at all.
The therapeutic event is the absence of data. I remain the worst control group.