MuNa/paper/paper.md

# Two Languages, Two Tracks: A Live Public-Advocacy Deployment of LLM-Mediated Pattern Language Synthesis

Bruno Postle¹ and Nikos A. Salingaros²,³

¹ Union Street Research, Sheffield, UK
² Department of Mathematics, The University of Texas, San Antonio, TX, USA
³ Thrust of Urban Governance and Design, Hong Kong University of Science and Technology (Guangzhou), Guangzhou, China

*Draft — target venue: Buildings (sequel to Postle, B.; Salingaros, N.A. "LLM and Pattern Language Synthesis: A Hybrid Tool for Human-Centered Architectural Design." Buildings 2025, 15, 2400).*

---

## Abstract

A prior paper (Postle & Salingaros, *Buildings* 2025, 15, 2400) introduced a
method for turning a curated subset of Christopher Alexander's *A Pattern
Language* into an experiential design narrative using a large language
model (LLM), demonstrated on a hypothetical university building. This
paper reports a live deployment of an extended version of that method in
an active, contested public process: an independent counter-proposal for
the new National Museum of Ecuador (Quito), written in response to public
objection to the winning entry of an international design competition. We
extend the original two-input chain (pattern subset + brief) with a third
input, a *form language* — a project-specific grammar of climatic
response, tectonics, material, color, and ornament, following Salingaros'
theoretical framework of pattern language and form language as
complementary, jointly necessary instruments. We generalize the bespoke
prompting used to produce this project's form-language grammar into a
reusable, placeholder-driven template, and validate that it generalizes to
an unrelated typology, region, and climate. From a shared narrative root
and a shared pattern subset and form-language grammar, the two authors
produced two divergent elaborations — two narratives and two illustrated
image sets (13 watercolor-register images; 25 photo-realistic images)
— that converge on compatible design moves while diverging sharply in
visual register, a divergence we attribute partly to a deliberate
difference in requested image medium and partly to a difference in how
much of the source material each image-generation prompt carried. We
report informal peer reception of this work at a public symposium,
including a substantive critique from a practicing architect that the
method, as run, produced "flavors, not solutions" because no single
coordinated floor plan underlies the independently generated images. We
discuss this and other limitations, and note — as one possible direction
for future work, not yet attempted — that an explicit plan-layout
generation stage could address it by mining spatial-adjacency information
already implicit in the pattern subset.

**Keywords**: pattern language; form language; large language models;
human-centered architecture; generative AI in design; participatory
design; Christopher Alexander; Ecuador; museum architecture;
public-advocacy design

---

## 1. Introduction

The dominant response of AI text-to-image tools to architectural prompts
is to invent an attractive building from a short stylistic description —
producing images that are slick, stylistically confused, and spatially
and culturally arbitrary, because nothing upstream of the image
constrains it. Postle and Salingaros [1] proposed an alternative: place
image generation at the *end* of a structured chain rather than at the
start, so that an LLM synthesizes an experiential design narrative from a
curated, human-readable set of Alexander's [2] patterns before any image
exists, and treats that narrative — not a mood-board prompt — as the
instrument that generates and disciplines images. That paper demonstrated
the method on a hypothetical university department building and used two
independent LLMs to cross-check a claim about the pattern-generated
design's likely effect on occupant productivity.

This paper reports two things the original paper could not: a **live
deployment** of the method under real stakes, and a **method extension**
that the deployment required.

The deployment: the Government of Ecuador ran an open international call
(Stage 1 deadline 17 February 2026) for the architectural preliminary
project of the new National Museum of Ecuador, on an approximately
13,000 m² site in Iñaquito, Quito. A winner was selected, but the winning design provoked
sustained public objection over its failure to serve the people who will
actually use it, and — at the time of writing — is on hold and may be
abandoned. Independently of that competition, a small informal team,
including both authors of this paper, used the method described in [1],
extended as described below, to write and illustrate a complete
counter-proposal: not a competition entry, but a public-advocacy document
intended to influence the outcome of the debate while the winning
scheme's fate is undecided. Unlike the earlier paper's case study, this
deployment was not written for the purpose of demonstrating the method —
the method was used because it was the fastest available way to produce
a serious, human-centered alternative in the time available, and this
paper is a report on what happened when it was used that way, in public,
under scrutiny.

The extension: the original method combined a pattern subset with a
project brief. For a museum expected to express Ecuadorian cultural
identity as much as to organize human activity, a pattern subset alone
was not sufficient — Alexander's patterns govern human/organizational
relationships (how people arrive, gather, move, rest) but say little
about how a building should look, or which regional material and
ornamental vocabulary it should draw from. We therefore added a third
input, a *form language*, following the theoretical distinction Salingaros
sets out in "Two Languages for Architecture" [3]: a pattern language
encodes rules for how human beings interact with built form, while a form
language encodes geometric and tectonic rules for how matter is put
together, and the two are jointly necessary — a form language that is not
adaptive to human sensibility cannot connect to a pattern language, and a
pattern language has no way to become a specific building without a form
language. Section 3 reports how this form-language instrument was
produced, and how we generalized its production into a reusable template.

The rest of the paper is a case study of what happens when this
three-input method is run twice from a shared narrative root and shared
pattern/form-language inputs, by two different authors, in public, and
then subjected to informal peer critique. Section 2 gives the background
of the competition and the specific, named failures the counter-proposal
was written to avoid. Section 3 describes the method extension. Section
4 reports the worked example as two divergent tracks. Section 5 reports
reception at a public symposium, including a substantive critique that
the method, in its current form, does not yet produce a coordinated
plan. Section 6 discusses this and other limitations honestly. Section 7
briefly sketches one possible direction for future work suggested by
that critique. Section 8 concludes.

## 2. Background: The Museo Nacional del Ecuador Competition and Its Discontents

The National Museum of Ecuador holds the country's national collection —
over 1.2 million objects and documents spanning roughly 12,000 years,
across five reserves (archaeology, colonial and republican art, modern
and contemporary art, a human-sciences library, and a historical
archive) — of which the institution states that under 1% can currently
be exhibited at once, for lack of space. The Stage 1 open call sought a
preliminary architectural project for a new building of at least 25,000
m² on an approximately 13,000 m² plot at the corner of Av. Eloy Alfaro and Av. de la
República in the Iñaquito parish of Quito, diagonally across from La
Carolina Park — one of Quito's most-visited public spaces, itself drawing
on the order of 400,000 visits a month — with direct access to the La
Carolina Metro station.

A winning scheme was selected, but has since drawn considerable public
objection. Independently of this paper's authors, a critique of the
winning proposal was recorded and circulated, analyzing it against
human-centered design and pattern-language principles, with
eye-tracking-derived visual-attention data supporting several of its
claims. That critique named specific, concrete failures rather than
general aesthetic complaints: an entrance that visual-attention scans
showed users could not locate (98% of attention going to non-entrance
openings and parked cars); blank facades assessed as generating anxiety
rather than welcome; and other legibility and human-scale failures. We
mined this critique for named, evidenced failures and mapped each to the
pattern(s) in our subset that directly counters it (e.g., illegible
entrances countered by Main Entrance / Entrance Transition / Entrance
Room), so that the counter-proposal's design decisions would explicitly
and traceably steer clear of documented problems, not just gesture at
being different in tone.

The counter-proposal — *Casa de la Memoria Andina*, in Postle's track;
*Casa de la Memoria Ecuatoriana*, in Salingaros' — is the product
described in the rest of this paper.

## 3. Method Extension: A Third Input — the Form Language

### 3.1 Two Complementary Languages

Salingaros' theoretical framework [3] holds that a pattern language and a
form language are distinct and jointly necessary. The pattern language
supplies the *organizational code*: which spatial relationships make a
building legible and humane — where entrances go, how circulation reads,
how outdoor rooms catalyze use. The form language supplies the *cultural
code*: how the building meets the ground, how walls and roofs are built,
which materials, colors, and ornament belong to the place, and where they
are permitted to concentrate. A pattern-generated design without a form
language has no way to decide what it is made of or what it looks like; a
form language without a pattern language risks producing a building that
looks locally authentic but is organizationally illegible or hostile to
use. The original paper [1] used only the first instrument. This project
required both.

### 3.2 The Ecuadorian Form Language Grammar

For this project, Salingaros produced a project-specific form-language
grammar, the *Ecuadorian Form Language Grammar*, developed after
discussion with a Quito-based designer and self-builder and synthesized
by an LLM from open-source reference imagery. Rather than a set of
historical facades to imitate, it is written as a *generative* vocabulary:
a stratified tectonic sequence from dark Ecuadorian andesite at the
plinth, through thick limewashed tapial and adobe at the lower and middle
levels, to lighter bahareque and timber at the crown, under red clay tile
roofs with deep *aleros*; a spatial lexicon of named local elements
(*atrio*, *zaguán*, *corredor*, *balcón corrido*, *mirador*, *canales*,
*rejas*); a restrained base color system ("Quito White & Andesite") with
a wider selectable palette; and an ornament system concentrating
geometric *chakana* and diamond-course motifs at base, threshold, and
crown, plus a single permitted figurative *retablo* episode — with
explicit prohibitions against superficial historicism, arbitrary facade
color patches, and decoration applied without tectonic reason. Where the
pattern language tells the building how to work, the form grammar tells
it how to belong.

### 3.3 Templating the Form-Language Step

The Ecuadorian Form Language Grammar was originally produced by a bespoke,
two-step prompting process specific to this project: an initial
exploratory prompt asking an LLM to research vernacular and historical
form across the region and propose a generative grammar rather than a
style to copy, followed by a second prompt narrowing scope to the
specific site and climate while retaining the wider regional vocabulary.
This process was not, as originally run, reusable — it existed only as a
conversational transcript specific to Quito.

We generalized it into `form-language-prompt-template.md`, a single-shot
prompt template with placeholder fields for typology, region,
site/climate, and historical strata, that collapses the two-step process
into one prompt and produces a grammar document in the same structural
shape (tectonic sequence, spatial lexicon, composition syntax, color and
ornament systems) as the Ecuadorian worked example — analogous to how the
web-based pattern-subset tool in [1] generalized manual pattern curation
into a reusable instrument.

To check that this generalized, rather than merely described, we ran the
template a second time on a project unrelated to Ecuador: *Harbor House*,
a travellers' inn intended to relieve pressure on homeless services, sited
in Sheffield, South Yorkshire — a different typology, region, and
climate, produced by the paper's first author. This second run also used
an LLM configuration with real web search available, so climate figures
and precedent references were checked against live sources and cited
inline rather than drawn purely from training-data recollection,
demonstrating the template is compatible with a stricter, source-checked
mode of use as well as the original's. The resulting document
(`templates/examples/sheffield.md`) follows the same section shape as the
Ecuadorian grammar while producing an entirely different vocabulary — dark
gritstone and coursed rubble rather than andesite, slate and Yorkshire
vernacular roof forms rather than red clay tile — which is the evidence
that the template captures a reusable *shape*, not a repackaging of
Ecuador-specific content.

## 4. Worked Example: Two Tracks From a Shared Root

### 4.1 Shared Inputs, Including a Shared Narrative Root

Both tracks reported below share the same project-specific pattern
subset of 55 patterns from Alexander, Ishikawa, and Silverstein [2],
curated using the APL-Companion web tool described in [1] and prepared
for this project by Salingaros, and the same Ecuadorian Form Language
Grammar (§3.2), condensed brief, and named-failure critique (§2). But the
two tracks are not two independent runs from those inputs alone: they
also share a common narrative ancestor. Salingaros' first prompt to an
LLM (see Data and Materials Availability) combined the pattern subset,
form language, and brief into an initial design narrative, *Casa de la
Memoria Andina*. This document is the root both tracks below grow from,
not merely a shared set of abstract rules: Track A's shared "chassis"
document (its own set of fixed invariants — site data, the
material/color/ornament systems, named circulation realms, and where
each part of the collection lives) adopts it as primary source, and
Track A's general-visitor narrative reproduces its prose almost wholesale
(§4.2); Track B's final narrative is this same document merged with a
second, independently drafted narrative from a different LLM (§4.3). The
two tracks are consequently better described as **divergent elaborations
of a shared root** than as fully independent runs — a distinction that
matters for how the convergence reported in §4.4 should be read.

### 4.2 Track A: Four-Stakeholder Narrative Synthesis

Following the narrative-writing approach of [1] §4.2, Postle's track
wrote four separate experiential narratives, one per stakeholder
viewpoint (general visitor, museum staff, school group, and
indigenous/community stakeholders whose heritage the collection
represents). Of these, the general-visitor narrative is substantially
the shared root narrative described in §4.1, reproduced with only the
minimal adjustments needed for consistency with the settled chassis; the
other three were written independently against the same chassis and
pattern/form-language inputs, without directly reusing the root text.
All four were cross-checked against the shared chassis document so that
a detail asserted by one stakeholder's narrative (a material, a color, a
named place) is never contradicted by another's, then combined **in
full**, not condensed, into a single public presentation document,
deliberately without pattern numbers or grammar codes, since it is
written to be read by the public, not by practitioners. Thirteen
illustration prompts were written, each self-contained (a shared style
guide, distilled from the form-language grammar into plain descriptive
language, pasted literally into every prompt, not cross-referenced —
rather than the source pattern-subset or form-language documents
themselves), and generated externally via Midjourney, producing images
in a **warm architectural watercolor and gouache register**, deliberately
requested — a painted presentation drawing, not a photo-realistic
render — with lighting, weather, and a consistent cast of figures held
constant across the set.

### 4.3 Track B: Single Merged Narrative

Salingaros' track produced a single narrative, *Casa de la Memoria
Ecuatoriana*, by merging the shared root narrative (§4.1) with a second,
independently drafted narrative from a different LLM, explicitly
instructed to combine the strongest elements of each against the same
pattern subset and form language. It was then illustrated with 25 images
from ChatGPT, requested and produced in a markedly more
**photo-realistic register**, with no watercolor or illustrative-medium
constraint applied. Salingaros reports, in his own first-person account
of the process (see Data and Materials Availability), an iterative,
natural-language critique loop run against these images: successive
rounds were rejected and corrected in plain language rather than by
editing pixels — a patio that read as faux-antique with trip hazards was
regenerated with flush, level pavers; an entrance that did not read as a
front door on approach was replaced by an axial view with a projecting
five-bay portal; a building raised too far above the street was brought
down to sidewalk grade; monochromatic tiled columns foreign to the
context were regenerated with patterned azulejos; and overly white
interiors, arbitrary facade color patches, and modernist metal railings
were each identified and revised, each correction traced back to an
explicit violation of the pattern subset or form grammar. This account is
self-reported rather than independently logged; the delivered image set
offers circumstantial, not conclusive, support — its file numbering
skips several indices and includes revised variants for at least two
images, consistent with an iterative reject-and-regenerate workflow
without proving one. Each reported cycle of criticism and regeneration
took minutes, not days.

Separately, and independent of any explicit request, each image prompt
Salingaros wrote for ChatGPT included the full pattern-subset and
form-language documents inline, rather than a distilled summary, while
Track A's Midjourney prompts (§4.2) were shorter, LLM-distilled,
scene-specific prompts referencing only the condensed style guide. This
difference in prompt strategy — not only the difference in requested
medium — is discussed as a candidate explanation for the image-register
divergence in §4.4 and §6.3.

### 4.4 Convergence and Divergence

Table 1 summarizes the two tracks.

| | Track A (Postle) | Track B (Salingaros) |
|---|---|---|
| Narrative structure | 4 stakeholder-viewpoint narratives, combined in full | 1 merged narrative |
| Relation to shared root narrative | visitor narrative = root text; other 3 written independently | root text merged with a second, independently drafted LLM narrative |
| Output document | `docs/counter-proposal.md` | `docs/3.Casa-de-la-Memoria-Ecuatoriana-*.txt` |
| Image generator | Midjourney | ChatGPT |
| Image count | 13 | 25 |
| Image register (requested) | watercolor / gouache illustration | no medium constraint; rendered photo-realistic |
| Image-prompt content | short, LLM-distilled style guide per scene | full pattern-subset + form-language documents inline per image |
| Consistency mechanism | shared chassis document (invariants) | iterative natural-language critique loop (self-reported, §4.3) |

Because Track A's visitor narrative and half of Track B's merge input
share the same root text (§4.1), part of the convergence between the two
tracks is expected rather than independently earned, and should not be
over-read as proof that the shared instruments alone drive agreement. The
more meaningful evidence for that claim comes from the material that was
*not* shared: Track A's other three stakeholder narratives, Track B's
second, independently drafted merge input, and — most significantly —
the two entirely separate image-generation stages, run by different
authors with different generators and no shared images. Across that
genuinely independent material, both tracks still arrive at the same
high-level design moves: a stratified material sequence from stone base
to timber crown; an *atrio* / *zaguán* / patio arrival sequence; a
legible, projecting entrance portal; warm-toned interiors with restrained
concentrated ornament; and circulation organized around named realms
rather than corridors. This is evidence, from a smaller and less
controlled sample than a fully independent two-track experiment would
provide, that the pattern subset and form-language grammar meaningfully
constrain the output beyond what shared text alone would explain.

The two tracks diverge sharply, however, in visual register: Track B's
images are, in the authors' own judgment, markedly more photo-realistic
and — subjectively — more visually compelling than Track A's
watercolor/gouache-register images. This judgment has not been evaluated
externally on a like-for-like basis: the symposium reported in §5
discussed Track B's images only, and Track A's images were not presented
there, so it should be read as the authors' own assessment, not as
corroborated outside reception. We attribute the divergence to at least
two factors, neither yet isolated from the other or from any residual
generator-quality difference: first, it is partly a deliberate,
requested difference — Track A's prompts explicitly specify a watercolor
and gouache medium, while Track B's prompts carried no illustrative-medium
constraint and rendered photo-realistically by default; second, as
reported in §4.3, Track B's prompts carried the full pattern-subset and
form-language documents inline, while Track A's carried a short,
distilled style guide, and the authors' working hypothesis is that
ChatGPT's greater tolerance for long, dense prompts let it resolve more
of the form language's specific vocabulary directly into each image,
where Midjourney's shorter prompts left more to the generator's own
defaults. This is a hypothesis, not a verified finding (see §6.3).

### 4.5 Three Passages, Two Image Sets

The claims in §4.1–§4.4 are easier to judge from the material itself than
from a description of it. This section shows three moments of the museum
— the corner arrival, the entrance threshold, and the first patio — each
as text from both tracks and as one image from each track's set.

**The corner arrival.** Both tracks open their description of the
building from the same street corner, in near-identical language. Track
A (Postle, reproducing the shared root narrative almost verbatim):

> From the corner of Avenida Eloy Alfaro and Avenida de la República, the
> museum does not announce itself as a single monumental object. It
> appears as a gathered family of white and grey masonry volumes rising
> from a broad platform of dark andesite... The building reads vertically
> as a tectonic history of the country: dark stone at the earth, thick
> limewashed tapial and adobe above it, and a lighter crown of timber and
> bahareque beneath the roofs.
> — `narratives/01-visitor.md`

Track B (Salingaros, same opening, independently elaborated):

> From the corner of Avenida Eloy Alfaro and Avenida de la República, the
> museum appears as a gathered family of white and grey masonry volumes
> rising from a terraced platform of dark andesite. The ground itself is
> shaped the way Andean building ground has always been shaped: slopes
> are carved into terraces of fitted stone, their retaining faces
> inclining slightly inward with the visual stability of pre-Columbian
> masonry... Against this field of tile, a small number of skyline events
> are reserved for the communal cores: a glazed lantern over the stair
> hall, a sculpted finial rising above the education wing.
> — `docs/3.Casa-de-la-Memoria-Ecuatoriana-Design-Narrative-Museo-Nacional-del-Ecuador.txt`

The two images below illustrate the same corner. Figure 1 is Track A's
watercolor register; Figure 2 is Track B's photo-realistic register —
the divergence discussed in §4.4 and §6.3, visible directly rather than
only described.

![Track A: the museum seen from the corner of Av. Eloy Alfaro and Av. de la República, Midjourney, watercolor and gouache register.](../docs/images/01-exterior-corner-view.jpg)

*Figure 1. Track A (Postle/Midjourney).*

![Track B: the same corner, ChatGPT, photo-realistic register.](images/track-b-01-corner-aerial.jpg)

*Figure 2. Track B (Salingaros/ChatGPT).*

**The entrance threshold.** This passage is the source of the
five-bay/three-arch discrepancy discussed in §6.1, and both tracks state
the same "five bays" claim, again in near-identical wording:

> The entrance projects from the façade as a deep stone portal composed
> in a rhythm of five bays — unmistakable from both avenues, but not
> overpowering... The transition is staged and bodily: street, atrio,
> portal, zaguán, patio — the museum never exposes itself all at once.
> — `narratives/01-visitor.md`

> The entrance projects from the façade as a deep stone portal composed
> in a rhythm of five bays — unmistakable from both avenues, its central
> bay carrying the finest carving and the great recessed wooden doors.
> Within those doors, a postigo, a pedestrian door-within-a-door, admits
> visitors at daily scale, so the museum is entered the way Ecuadorian
> buildings have always been entered.
> — `docs/3.Casa-de-la-Memoria-Ecuatoriana-Design-Narrative-Museo-Nacional-del-Ecuador.txt`

Neither track's entrance image matches this shared text, and the two
images do not match each other either: Track A's shows a three-arched
loggia (Figure 3); Track B's shows a single deep portal with no
bay rhythm at all (Figure 4). This is the clearest available
demonstration of §6.1's point — a coordinated *text* does not produce a
coordinated *building*, because nothing connects either image-generation
stage back to the written bay count.

![Track A: the entrance portal, three arches shown against a text describing five bays.](../docs/images/04-entrance-portal.jpg)

*Figure 3. Track A (Postle/Midjourney).*

![Track B: an alternative entrance portal treatment, a single deep archway.](images/track-b-02-entrance-portal.jpg)

*Figure 4. Track B (Salingaros/ChatGPT).*

**The Patio of Origins.** Again near-identical text:

> The first realm is the Patio of Origins, proportioned so that the high
> equatorial sun reaches the paving and planting while the surrounding
> corredores remain in shade... Rainwater falls from expressed canales
> into shallow stone-lined rills that cross the court toward planted
> basins.
> — `narratives/01-visitor.md`

Figures 5 and 6 show the same courtyard moment in each register. Track
B's image (Figure 6) is also a useful, unflattering instance of the
hallucination symposium participants warned about in §5: its building
signage reads "Museo América Andina," not "Museo Nacional del Ecuador"
— a small, honest example of the kind of close-inspection error the
critique in §5 describes, preserved here rather than cropped out.

![Track A: the Patio of Origins, with a fountain and colonnade.](../docs/images/05-patio-of-origins.jpg)

*Figure 5. Track A (Postle/Midjourney).*

![Track B: a courtyard with fountain and colonnade; the wall signage reads "Museo América Andina," an instance of the hallucination discussed in §5.](images/track-b-03-patio-fountain.jpg)

*Figure 6. Track B (Salingaros/ChatGPT). Signage error visible on the right-hand wall.*

## 5. Reception: Informal Peer Engagement at the July 2026 Symposium

On 23 July 2026, this counter-proposal project was discussed at a public
symposium including Salingaros, Nir Buras (Classic Planning Academy),
Pablo Álvarez Funes, and others, walking through Track B's narrative and
image process. We treat this as informal peer engagement, valuable
precisely because it included substantive disagreement rather than only
endorsement.

Participants praised the images' consistency of "spirit" — not pixel
repetition of a single scheme, but a recognizable design language holding
across independently generated views. But a practicing architect on the
panel, Pablo Álvarez Funes, raised a critique that is the paper's most
important piece of reception data: *"this Nikos did not create a
plan... we need to give a response to the program and ensure that all
the spaces work coordinately."* He characterized the current output as
a set of well-crafted individual rooms rather than a linked building,
adding that close inspection of the images — *"especially at the
corners"* — reveals AI hallucinations, and summarized bluntly: *"these
are images. These are flavors. These are not solutions."* The same
discussion noted the continuing, non-optional role of licensed
architects in taking such material to floor plans, elevations, sections,
and mechanical/electrical/plumbing/structural coordination before
anything could be built.

This critique is correct as stated, and it is not new information to the
authors — it names precisely the gap described honestly in the original
paper's limitations section [1] and inherited unchanged by this
extension: the method produces experiential narratives and illustrative
images of a design, not a coordinated plan. What the symposium adds is an
unsolicited, on-the-record confirmation from outside the authors' own
team that this gap matters. We return to it in §6.1 and note one possible
response, briefly, in §7.

## 6. Discussion: Drawbacks and Open Questions

### 6.1 No Coordinated Floor Plan

Because each narrative and each image is generated independently against
shared *rules* rather than against a shared *drawing*, spatial claims
made across different illustrations of the same design are not
guaranteed to reconcile. A concrete instance from this project: the
narrative describes the entrance portal as composed in "a rhythm of five
bays," but the corresponding illustration shows three arches. Rather than
regenerating the image to match the text or rewriting the text to match
the image, we treated the narrative as the design intent of record — it
is the instrument the pattern subset and form grammar were synthesized
into, and is where every design claim is traceable — and loosened only
the image's caption to avoid asserting a bay count the image does not
show. This is a defensible correction for a single instance, but it does
not scale: it works because a human noticed the discrepancy and had a
clear rule (text over image) for resolving it, not because the method
prevents such discrepancies from arising.

### 6.2 No Mechanism for Genuine Public Participation

The method as deployed here produces material intended to influence
public debate, but has no built-in mechanism for the public to actually
participate in shaping it beyond viewing and reacting to finished
narratives and images — e.g., informal social-media voting on generated
images. Symposium participants warned that such unfiltered voting
degenerates without curation (toward whichever image is most
immediately eye-catching rather than most sound), which is a caution
worth taking seriously if this method is to be used for participatory
design rather than only advocacy communication.

### 6.3 Partly-Explained Divergence in Image Register

As reported in §4.4, Track B's photo-realistic images are, in the
authors' own assessment, more compelling than Track A's watercolor-register
images — a judgment the authors have made themselves, not one
corroborated by outside reviewers evaluating both sets side by side. We
attribute the divergence partly to a deliberate difference in requested
medium (photo-realistic vs. watercolor/gouache) and partly to a
difference in image-prompt content (the full pattern-subset and
form-language documents fed inline to each Track B prompt, versus a
short distilled style guide for each Track A prompt), on the working
hypothesis that ChatGPT's greater tolerance for long, dense prompts
let it resolve more of the form language directly into each image. Both
factors are plausible and neither has been isolated from the other or
from any residual difference in generator capability — a controlled
comparison (same narrative text, same requested medium, both generators)
would be needed to separate them, which is outside the scope of this
paper.

### 6.4 Unsettled Questions of Authorship and Structural Readiness

As with the original method [1], these outputs are concept studies, not
architecture: structure, egress, conservation environments, accessibility
compliance, and budget still require conventional technical development,
and questions of authorship and intellectual property in AI-assisted
imagery remain unsettled in general, not resolved by anything specific to
this project.

## 7. Possible Future Work

The critique in §5 points toward one possible direction for extending
the method, which we note here briefly without committing to it or
having attempted it: an explicit plan-layout generation stage, inserted
between the pattern-subset/form-language inputs and narrative
generation, that would make the spatial and adjacency relationships
already implicit in the pattern subset (building complexes, wings,
connected buildings, circulation realms) explicit as a shared layout for
narratives and images to be checked against, rather than each
independently inventing one. This is a proposal in prose only — no
prototype has been built for this paper, and we do not treat it as the
method's necessary next step so much as one plausible answer to a real
critique among others an architect might reasonably prefer.

A separate, lower-priority open question is the image-register divergence
of §6.3: a controlled comparison isolating requested medium from
prompt-content length would help settle how much each contributes, but
is not required to support this paper's central claims.

## 8. Conclusion

This paper reported a live deployment of an extended version of the LLM
pattern-language synthesis method introduced in [1], used in earnest, in
public, under real contested stakes, rather than as a hypothetical case
study. The deployment required a genuine method extension — a third
input, the form language, following Salingaros' theoretical distinction
between the human/organizational and geometric/tectonic languages of
architecture — which we generalized from a bespoke, project-specific
prompting process into a reusable template and validated on an unrelated
project. Run by two authors from a shared narrative root and shared
pattern subset and form language, the method's two divergent elaborations
converged on compatible design moves in their genuinely independent
material, while producing a qualitatively different image register, a
difference we can partly, though not yet fully, account for. Presented
to informal peer scrutiny, the work drew a substantive critique, not
only praise: that the method, as deployed, produces images without a
coordinated plan behind them. We agree with that critique and take it
seriously; §7 sketches one possible response without committing to it as
the method's necessary next step. Design knowledge, once written down as
readable rules rather than embodied only in a single expert's intuition,
can be executed, checked, criticized, and revised at the speed of
conversation — but a pattern language and a form language, however well
executed, are not yet a plan, and this deployment's clearest lesson is
that the method should say so honestly rather than let illustrative
images stand in for one.

---

## References

1. Postle, B.; Salingaros, N.A. LLM and Pattern Language Synthesis: A
   Hybrid Tool for Human-Centered Architectural Design. *Buildings* 2025,
   15, 2400. https://doi.org/10.3390/buildings15142400
2. Alexander, C.; Ishikawa, S.; Silverstein, M. *A Pattern Language:
   Towns, Buildings, Construction*; Oxford University Press: New York,
   NY, USA, 1977.
3. Salingaros, N.A. Two Languages for Architecture. In *A Theory of
   Architecture*; Sustasis Press, 2006; revised 2014.

## Data and Materials Availability

All primary materials referenced in this paper are project documents
rather than independently published data, and are cited here by their
path in the originating repository for traceability rather than as
formal references:

- Pattern subset: `ref/A Pattern Language Ecuador National Museum.md`
- Ecuadorian Form Language Grammar: `ref/Ecuadorian_Form_Language_Grammar.md`
- Condensed brief and named-failure critique:
  `ref/brief-condensed.md`, `ref/critique-failures.md`
- Shared invariants ("chassis"): `ref/project-chassis.md`
- Shared root narrative and the prompts that produced it:
  `docs/Casa-de-la-Memoria-Andina-National-Museum-Narrative-Kimi.txt`,
  `docs/salingaros-narrative-prompt.md`
- Form-language prompt template: `templates/form-language-prompt-template.md`
- Template validation on a second project: `templates/examples/sheffield.md`
- Track A narratives and public document: `narratives/01-visitor.md`
  through `narratives/04-community.md`; `docs/counter-proposal.md`;
  illustration prompts, `docs/illustration-prompts.md`; images,
  `docs/images/`
- Track B narrative and images:
  `docs/3.Casa-de-la-Memoria-Ecuatoriana-Design-Narrative-Museo-Nacional-del-Ecuador.txt`;
  `docs/images-salingaros/`; process report,
  `docs/From-Pattern-Language-to-Architectural-Image-Salingaros-revised.md`
- Paper-specific figure copies (Track B images, resized/compressed for
  this document; Track A figures are referenced directly from
  `docs/images/`): `paper/images/`
- Symposium transcript: `ref/youtube-transcript-2026-07-23.txt`
- Winning-scheme critique transcript: `ref/youtube-transcript.txt`