# Outline — Follow-up paper: plan-layout extension of LLM pattern synthesis

Working title: *From Pattern to Plan: Extending LLM-Mediated Pattern
Language Synthesis with a Form-Language Layer and a Live Public-Advocacy
Deployment*

Authors: Bruno Postle, Nikos A. Salingaros

Target venue: *Buildings* (sequel to Postle & Salingaros, "LLM and
Pattern Language Synthesis: A Hybrid Tool for Human-Centered
Architectural Design," *Buildings* 2025, 15, 2400 —
`ref/buildings-15-02400-v2.txt`)

Status: outline only, agreed structure, no full prose yet.

## 1. Introduction

Recap the original pattern → narrative → image chain from the 2025
paper. Frame this paper as reporting a **live, high-stakes
public-advocacy deployment** — not a hypothetical case study — plus a
**method extension**: the Ecuador National Museum counter-proposal, an
independent alternative developed while the winning competition scheme
is on hold pending public objection.

## 2. Method extension: three inputs instead of two

The original method combined a pattern-language subset with a project
brief. This project adds a third input, run in parallel with it: a
**form language**, per Salingaros' "Two Languages for Architecture"
(`ref/Salingaros-Chapter-11-Two-Languages-for-Architecture.md`) — the
pattern language governs human/organizational rules, the form language
governs geometric/tectonic rules (climate response, material,
color, ornament, historical strata).

Inputs used:
- Pattern language: `ref/A Pattern Language Ecuador National Museum.md`
  (55 patterns, curated via APL-Companion)
- Form language: `ref/Ecuadorian_Form_Language_Grammar.md`
- Brief/critique: `ref/brief-condensed.md`, `ref/critique-failures.md`

## 3. Templating the form-language step

Salingaros' original form-language grammar was produced by a bespoke,
non-reusable two-step prompt (`docs/salingaros-form-language-prompt.md`).
This paper generalizes it into `templates/form-language-prompt-template.md`
— a single-shot, placeholder-driven instrument (typology / region /
site-climate / historical strata) that produces a grammar document in
the same section shape, analogous to how the APL-Companion tool
generalized pattern-subset curation in the original paper. Reusable on
future projects outside Ecuador.

## 4. Worked example: two independent runs from shared inputs

Same pattern subset + same form-language grammar, fed into two
**separate LLM pipelines**, run independently by the two authors, with
divergent outputs:

- **Postle track**: four stakeholder narratives (visitor, staff, school
  group, community) → `docs/counter-proposal.md`, illustrated with 13
  Midjourney images (`docs/images/`).
- **Salingaros track**: a single merged narrative,
  `docs/3.Casa-de-la-Memoria-Ecuatoriana-Design-Narrative-Museo-Nacional-del-Ecuador.txt`,
  illustrated with 25 ChatGPT-generated images (`docs/images-salingaros/`).

Report as a qualitative finding, not a controlled comparison: the two
image sets differ markedly in register. Salingaros' ChatGPT images read
as photo-realistic and are, by informal consensus among the authors and
symposium participants (see §5), the more visually compelling of the
two; Postle's Midjourney images are looser and more watercolour-like.
**The cause is not established** — candidate variables include the
generator itself, prompt phrasing, and how literally each generator
resolves the same form-language vocabulary — and the paper should
flag this openly rather than assert an explanation it hasn't tested.
Given this, **the paper's illustrative material should draw primarily
on the Salingaros/ChatGPT image set**, using the Postle/Midjourney set
only for the explicit two-track comparison in this section, not as the
paper's default visual register elsewhere.

## 5. Reception

The July 23 symposium (`ref/youtube-transcript-2026-07-23.txt`) as
informal peer engagement, on the record:
- Praise for aesthetic consistency of "spirit" across the (Salingaros)
  images, without demanding pixel-identical repetition (~l.1295–1304).
- Substantive critique from a practicing architect (Pablo Álvarez
  Funes): "this Nikos did not create a plan" (l.1475); "these are
  images, these are flavors, these are not solutions" (l.1499);
  hallucinations visible on close inspection of corners (l.1496); need
  for licensed architects to turn the images into buildable floor
  plans, elevations, sections, and MEP/structural coordination
  (l.1214, l.1484).

## 6. Drawbacks

- Images are inspirational/illustrative, not derived from one
  coordinated floor plan — spatial claims across images aren't
  guaranteed to reconcile. Concrete instance from this repo: the
  entrance-portal image shows three arches against a five-bay text
  description; resolved by loosening the image caption rather than
  rewriting the design narrative (the narrative is the design intent
  of record).
- No mechanism yet for genuine public participation beyond unfiltered
  social-media image voting, which the transcript participants warn
  degenerates without curation.
- Open, unexplained variable: why one generator's output reads as more
  architecturally credible than the other's for the same inputs (§4) —
  noted as a limitation of the method's current image stage, not
  resolved here.

## 7. Next steps

Propose (not prototype, per author decision) plan-layout generation as
a missing stage: mining the pattern subset's implicit spatial/adjacency
relationships (e.g. `project-chassis.md`'s named circulation realms)
into an explicit layout layer that narratives and images could be
derived *from*, rather than each being independently invented — directly
answering the "this did not create a plan" critique in §5. See
`ecuador-0u5` for an exploratory prototype that may or may not land in
time to fold into this section.

Secondary open question, lower priority: whether the image-register gap
observed in §4 is attributable to the generator, the prompt, or
something else — worth a controlled comparison (same narrative, same
style-guide text, both generators) if time allows, but not required for
this paper's core claims.

## 8. Conclusion