The Sleeve's lexicon had forty-seven terms.
Dayo had written most of them. Some had come from the first cohort of process artists who workshopped the technology in its early years, contributing language the way musicians contribute notation — not inventing the thing, but making it nameable. Reach and trace and forty-seven seconds and the unwieldy but necessary pre-commitment interval, which described the 200-300 millisecond window before an intention solidified into movement, the moment just before wanting became doing.
Greta Voronova had been working in that window for twenty-two years.
She did not know the Sleeve's lexicon. She had her own.
The first day she said: drift. Not a clinical term — her word, private, not shared with colleagues who would not have known what to do with it. Drift was what happened when a patient's movement separated from the instruction that had prompted it, when the body was doing something the chart was not tracking.
Dayo had written it down.
The third day she showed him something more specific.
The patient's chart was good: steady progress, expected trajectory, full compliance. Greta pulled up the process recording without preamble and waited. The recording showed what the chart could not: a micro-hesitation, persistent across six weeks of sessions, in the pre-commitment interval, every time, in the same window, with the same character. Not fear. Not fatigue. Something older.
Dayo: The hesitation is before the intention, not after it.
Greta: I have seen this for six weeks. The chart says he's improving.
Dayo: He is improving. And he's also carrying something the chart cannot hold.
She was quiet. Then: In my vocabulary, this is drift with source. Drift is separation from the instruction. Drift with source is separation from something further back than the instruction. She paused. I have not been able to say what the source is. I only know it is not the injury.
Dayo wrote it down.
Forty-eight terms.
The residency had been designed to bring the Sleeve's language to clinicians working without it — give a name to what they had been doing without a name. The theory of the transfer: instrument arrives, vocabulary arrives with it, intuition becomes legible.
What Dayo was finding, three days in, was that Greta's intuition had already produced vocabulary. Not the Sleeve's vocabulary — her own, built over twenty-two years in the instrument's absence, fine-grained in ways the Sleeve's lexicon had not needed to be because the instrument could measure what the vocabulary had no words for.
Drift with source was more specific than anything in the forty-seven terms. The Sleeve's system could detect the hesitation. It could not, without this term, say what the hesitation was about.
Dayo called Priya that evening. The residency is teaching me things I did not know to look for.
Priya: That is what a residency is supposed to do.
Dayo: I thought I was the one teaching.
Priya: You're the one with the instrument. She's the one with twenty-two years. Did you think those were the same thing?