# How fiat and bona fide divisions carve contact, vagueness, and dimension **Artwork**: **Artist**: Arnaud Quercy **Asset**: IDS-RNI0180 **Serial**: NAN-RDG000127 This SEP entry is a technical survey of metaphysical theories of boundaries — spatial, temporal, and mereological puzzles about contact, fiat vs. bona fide demarcation, vagueness, and dimensionality — and none of the ideamorphism propositions (about ideas, transliteration, codices, ouvertures, diffraction) make any claim that touches these questions; any apparent echo (e.g. fiat/bona fide sounding like physical/intentional invariant) would be a verbal coincidence rather than a tested claim. ## Context ### Declined — `no-purchase` [@source] ### Propositional grid [@p31] > **Read this grid.** “Not evaluated” does **not** mean the source has nothing to say about that proposition. It means **the reading did not instruct it**. That is not a result, and it counts in no denominator. A silence, by contrast, is a finding: the reading touched the proposition without concluding, or noted its absence itself. **Not evaluated (37)** — P1, P2, P3, P3a, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P14a, P14b, P15, P16, P16a, P17, P18, P18a, P19, P19a, P20, P21, P22, P23, P24, P25, P26, P27, P28, P29, P30, P31 --- *Overall verdict: **DECLINED:no-purchase** — taxonomy of the August 2026 pass, predating the move to relational verdicts. Kept as metadata: the gap between the two forms is data, not residue. This reading’s judgement is in the grid above.* Reading of 2026-07-18 · model `claude-sonnet-5` · source 167,068 chars · 1 attempt(s) --- ### First pass — kept as written *Reading produced by the T50 RSS pass, before the boundary lens. It is reproduced UNCORRECTED. Keeping it is the point: without it, a changed title is just a changed title — with it, what the second pass refused becomes legible.* > Varzi's revised entry on boundaries is ideamorphically resonant as a meditation on the PHYSICAL INVARIANT — the unconditionally stable material fact that cannot be altered by any ouverture. A boundary between Maryland and Pennsylvania is not a matter of perception or interpretation; it is a formal, measurable constraint. Yet the entry also probes the paradox: boundaries are simultaneously ontologically real and conceptually constructed. This mirrors ideamorphism's dual invariant structure: the physical invariant (the line exists) and the intentional invariant (why we draw it there, what it means). Boundaries are where diffraction CANNOT occur — they are the hard edges that force the wave to scatter. Understanding boundaries is understanding what resists transformation, what remains 1=1 even as everything else diffracts. This is foundational to engineering diffraction: you must know what cannot be lost. T50 RSS assessment · 2026-07-18 · remplacée par `boundary-lens-2026-08`