# C870 — Recover the full reflection of the primary display

## Question

Which part of the chiasm is automatic grid closure and which part is supplied placement?

## Inputs

```json
{}
```

## Sources

```json
[
  "File54 primary chiasm",
  "C860,869"
]
```

## Opened utc

2026-09-28T02:45:22.686686+00:00

## Results

```json
{
  "reflection": {
    "path": "model/NT_primary_reflection.json",
    "sha256": "f8d0f90c2df70d00c1860bba662e5b44f509ff956993a095f01ee1e9e0e1a460",
    "bytes": 6988
  },
  "marked": {
    "outer_pair": [
      -5325,
      65
    ],
    "BJ_pair": [
      -3855,
      -1405
    ],
    "center_civil": -2630,
    "center_BC": 2631
  }
}
```

## Finding

Reflection x→−5260−x closes the entire primary grid and sends coarse indexm to11−m. Closure follows from uniform spacing; the placement of BJ Creation and Conquest at swapped indices21 and56 is the supplied structural fact.

## Reassessment

Checkpoint the completed NT transfer, then test Key domains beyond the homogeneous display.

## Checks

```json
{
  "full_closure": true,
  "coarse_closure": true,
  "marked_pair": true,
  "center_between": true
}
```

## Closed utc

2026-09-28T02:45:22.687340+00:00

## Record provenance

Exact record hash: `c5ecb28c7d72d1ad6512bb04a55589e9abdb6197051c16431c18164ba5199f4c`

Source journal: `Research_Cycles/C0832_C0931/journal.json`