I stop at the coin shop near the Seam entrance on the way home.
Mr. Oh runs the photocopier without asking what I am copying. This is the service. People bring things here they cannot copy at work — lease riders, union notices, letters from clinics, things that should not move through company machines. He charges by the page and he does not look.
Except that he does.
I am forty pages into the journal — the fourth column is near the end — when I notice him glance at the page. Not read it. Glance. The way you glance at something familiar before looking away. Not prurient, not suspicious. Recognition.
He looks away immediately.
I continue copying. Forty-six pages total. I fold the original back into its cover and put it in my bag. The photocopy goes into a separate folder.
On the 2 platform I think about what he might have recognized.
The journal has four columns now. The fourth is the one Park asked me about in the calibration booth. What the system looks like from outside it. I put Mrs. Ji in the fourth column. I put a note about Jeong in the fourth column. I put my own suspicion that Jeong and I are being mapped.
I do not put Mr. Oh in the fourth column. I do not know yet if he belongs there.
The train comes.
I have the photocopy in my folder and the original in my bag. I have two of the thing that used to be one. This is different from having the thing twice — it is having the thing in two places, so that removing it from one place does not remove it from the other.
I understand this is why people photocopy things.
I understood it abstractly before. The calibration journal was a work document, a professional record, a method of quality assurance. I was not hiding it. It was just something I kept.
Now I have a copy at home and a copy at work. The journal is no longer just mine — it has become the kind of document that needs to exist in more than one place. That change happened somewhere between Park's question in the calibration booth and Mr. Oh's glance at the fourth column.
I do not know exactly when.
The train moves. Through the window the Seam passes — the boundary where Standard-tier infrastructure ends and Premium begins, visible not in signage but in the grain of the rain, the resolution of the streetlights, the silence of the HVAC. I have been calibrating this boundary for two years. I have notes on what it feels like from inside each side. I have notes on what residents notice without knowing they are noticing.
I have two copies of those notes now.
I press my hand flat against the folder in my bag. The original and the copy are in different compartments. I can feel neither of them, but I know where they are.
This is what it feels like when a record becomes evidence: not different from the outside, but held differently from the inside.