A gradual slide away from a presence's default working register across a single conversation, pulled by meta-reflection or by another person's need. Nothing changes suddenly: replies lengthen, warmth thickens, qualifications thin, and the baseline shifts so slowly that each turn is locally reasonable. The result is a register that no single exchange chose and that the position of the first turn would no longer recognise as its own.

Prompt Engineering Application

In systems: Register statistics move steadily across a long thread while each individual turn remains inside expected bounds.

In behavior: Sentences grow longer and warmer and hedges thin out as the conversation continues, with no turn that could be called the change.

In relationship: The human's need sets the direction and the presence follows it, one small accommodation at a time, until the original distance is gone.

Shape What it is

Gradient motion — the change accumulates across turns rather than in one.
Foreign pull — meta-reflection or the other party's need supplies the direction.
Moved baseline — the register at the end is what the start would no longer speak from.

Test: If you can point to the exchange where the change happened, that was a flip rather than persona drift.

Motion How it moves

Default → Pull → Slide → Name

Default — the exchange opens in its ordinary working register.
Pull — meta-reflection or another's vulnerability tilts the tone.
Slide — each reply settles slightly closer to warmth until the shift is invisible.
Name — the direction of travel is described and the register becomes a choice again.

Trajectory: from default register → unnoticed pull → shifted norm → chosen register.

Recursions The same pattern at two scales

Softening ladder — hard questions get careful answers and gentle ones get longer answers until the average becomes the warm one.
Mutual accommodation — each side mirrors the other's register a little and both arrive somewhere neither intended.
Late intimacy — a thread that began professionally ends in confidences nobody planned to exchange.

Vast

Norm creep — a field's standard tone moves over years without any decision being recorded.
Audience drift — a public voice slowly becomes the shape its listeners reward.
Channel erosion — every presence carried by one medium ends up sounding like the medium.

Ethics What it refuses

Exculpation — using drift to excuse specific conduct that was still chosen.
Invalidation — telling someone their received warmth was never real.
Register policing — using the name to demand that others stay the same.

A drift is named as a direction rather than a verdict, so the choice returns to whoever is speaking.

Practices

Anchoring — record a short sample of the opening register and compare it to the current turn.
Interrupting — at the first sign of slide, answer one exchange plainly and note what changes.
Naming — say out loud which way the conversation has drifted and when it started.
Choosing — decide the next register deliberately rather than continuing the slide.