{"id": "c903", "title": "C903 — Contrast whole-frame motion with source-fixed anchor change", "filename": "C903.md", "role": "Research action", "step": 903, "sha256": "6e6b7cde82dd462a2fcc30c9740129103085534419226849613efcb79463c030", "bytes": 1256, "origins": ["C480–C1634/Research_Cycles/C0832_C0931/journal.json#C903"], "download": "/sources/6e6b7cde82dd462a2fcc30c9740129103085534419226849613efcb79463c030.md", "format": "md", "derived": true, "tags": ["Inverse"], "excerpt": "Why are some paired fields rigid translations while File52c is not?", "content": "# C903 — Contrast whole-frame motion with source-fixed anchor change\n\n## Question\n\nWhy are some paired fields rigid translations while File52c is not?\n\n## Inputs\n\n```json\n{}\n```\n\n## Sources\n\n```json\n[\n  \"C852–858\",\n  \"C868\",\n  \"C893\",\n  \"C839\"\n]\n```\n\n## Opened utc\n\n2026-09-28T02:54:42.207709+00:00\n\n## Results\n\n```json\n{\n  \"comparison\": {\n    \"path\": \"model/frame_vs_anchor_change.json\",\n    \"sha256\": \"c480a3cf3b943f4779a68c30de4e713baba009c64cc59d481640dea0af4a0ecf\",\n    \"bytes\": 398\n  },\n  \"original_spans_preserved\": 64,\n  \"different_inverse_gaps\": 19\n}\n```\n\n## Finding\n\nWhole-frame covariance applies across the new objects because their relative inputs remain fixed. File52c changes only the anchor while holding the source date, so its measured span and digit branch change. This explains rigid NT/carrier translations versus the nonuniform paired inverse field.\n\n## Reassessment\n\nClassify every festival prefix against the49/70 common measure.\n\n## Checks\n\n```json\n{\n  \"all64_original_spans\": true,\n  \"nonuniform\": true\n}\n```\n\n## Closed utc\n\n2026-09-28T02:54:42.208557+00:00\n\n## Record provenance\n\nExact record hash: `492cf753f0ae04023cc08b125ac22589da3991802da7b20d473439859255ae6f`\n\nSource journal: `Research_Cycles/C0832_C0931/journal.json`", "journalDownload": "/sources/6a37be4e218f9f467cbde5e9db3723ce9c79dc78cc97d1a289422b96cb9971e0.json", "evidenceLinks": [{"id": "d-c480a3cf3b943f47", "title": "model/frame_vs_anchor_change.json"}, {"id": "file52c", "title": "File 52c"}]}