Origin — a parent born inside a child¶

Split-Domain Cognition was named inside Koher.

In the early months of Koher's design — winter 2025 into spring 2026 — the practice needed an internal grammar for what its tools were doing: AI for the language layer, deterministic code for the judgement layer, humans at the seam. The grammar was scaffolding. It belonged to Koher the way a load-bearing wall belongs to a particular house.

Then the wall turned out to belong to other houses.

Once named, the separation kept appearing in places the tools had nothing to do with. Curatorial practice. Animal-rights argument. Studio pedagogy. Ethical writing. Editorial work. Psychiatric description. Urban planning. The same collapse — language work and judgement work fused in one channel, with the same predictable failures — was visible in domains that no AI pipeline could reach. The pattern was not an architectural trick. It was a principle, and the principle had a wider domain than the practice that found it.

In April 2026 the move was made structural. Split-Domain Cognition was lifted out of Koher into its own top-level project at splitdomaincognition.org. Koher was narrowed: a practice for tools that follow SDC. The folder that had been nested inside Koher became the parent project that Koher now declares allegiance to.

The inversion is the honest record. The parent was born inside the child. The nestling space became the parent. Koher is now one of several adopters of the principle it first named.

This page exists so the genealogy is not lost. Practices that begin inside other practices and outgrow them are not unusual; what is unusual is to keep the lineage visible after it inverts.