# Is this original?
> **Demo Mode.** This report was produced from fixture evidence, not from live web search or live model sampling. It demonstrates the format and the arithmetic; it is not research.

## Answer
Within the sources searched and model samples generated, the central position is already stated in the sources examined, but its proposed mechanism is close to accounts already in circulation.
**Originality Estimate:** 43/100  
**Qualified Originality:** 37/100  
**Confidence:** low
Originality Estimate is a weighted heuristic: 30% deviation from public search, 25% rarity against the model baseline, 20% mechanism and structural novelty, 15% consequential difference, 10% specificity. Qualified Originality multiplies it by a coherence factor (0.889) and a testability factor (0.955).
## Summary
This analysis compared the submission against 58 retrieved sources and 60 base-model samples. The Originality Estimate of 43/100 is driven mainly by how readily ordinary search surfaces adjacent material. Qualified Originality (37/100) applies coherence and testability as dampeners: an unusual idea that cannot be tested is reported as unusual, not as promising. Confidence is low. This run used fixtures, so confidence is capped at low regardless of what the numbers suggest. None of this establishes that the idea has never appeared before. It describes where the idea sits relative to the evidence this run examined.
## Idea fingerprint
- **Central position:** Street-tree cooling in dense cities is driven mainly by shading building facades and suppressing night-time longwave re-radiation in street canyons, not by evapotranspiration.
- **Proposed mechanism:** A shaded facade absorbs substantially less solar energy during the day, so it stores less heat and re-emits less longwave radiation into the canyon after sunset; the canopy's effect on air temperature is therefore mediated by the building surface rather than by moisture flux.
- **Conventional position modified or rejected:** Urban tree cooling is primarily attributed to evapotranspiration, with shading treated as a secondary daytime contribution.
- **Concepts connected:** urban heat island, street canyon geometry, longwave radiation budget, tree canopy cover, facade thermal mass
- **Assumptions:** Facade thermal mass is a large enough share of canyon heat storage to dominate the night-time budget.; Transpiration rates in street conditions are low enough not to offset the facade effect.; Canyon geometry can be measured accurately enough to target planting by it.
- **Predictions:** Night-time cooling should scale with shaded facade area rather than with leaf area.; Narrow east-west corridors should show larger 3am temperature reductions than equivalent canopy added to open parkland.; The difference should be on the order of 1-2 degrees Celsius at 3am over a summer.
- **Practical consequences:** Planting programmes budgeted by canopy percentage would systematically underperform ones targeted at canyon geometry.; Cooling benefit estimates derived from leaf-area indices would be biased in dense districts.
- **Recommended action:** Authorities should prioritise planting on narrow east-west streets over expanding open parkland where night-time heat is the binding constraint.
- **Domain:** urban climate
- **Canonical sentence:** Street trees cool dense cities mainly by shading facades and cutting night-time longwave re-radiation, not by evapotranspiration.
## Scores
| Score | Value | Reading |
| --- | --- | --- |
| Position originality | 45 | Higher = the central claim was harder to reach |
| Mechanism originality | 11 | Higher = the proposed pathway was harder to reach |
| Conceptual-combination originality | 69 | Higher = this pairing of concepts was harder to reach |
| Prediction originality | 58 | Higher = the predictions were harder to reach |
| Practical-consequence originality | 46 | Higher = the consequences drawn were harder to reach |
| Search accessibility | 95 | Higher = ordinary search finds it more easily |
| Model accessibility | 31 | Higher = ordinary prompting produces it more easily |
| Coherence | 63 | Higher = the argument follows |
| Specificity | 88 | Higher = more concrete and quantified |
| Testability | 85 | Higher = easier to falsify |
| Evidential grounding | 61 | Higher = better anchored in checkable evidence |
## Closest public-search matches
- **Essentially identical** — [urban heat island street canyon geometry: the position stated and defended](https://conference-proceedings-track-b.fixtures.isthisoriginal.example/84643) (conference-proceedings-track-b.fixtures.isthisoriginal.example), label confidence 0.82
  The source advances the same position and the same proposed pathway, with a comparable practical recommendation. Its evidence is preliminary and single-site, which limits how much weight this match should carry.
- **Essentially identical** — [urban heat island street canyon longwave: the position stated and defended](https://conference-proceedings-track-b.fixtures.isthisoriginal.example/46820) (conference-proceedings-track-b.fixtures.isthisoriginal.example), label confidence 0.81
  The source advances the same position and the same proposed pathway, with a comparable practical recommendation. Its evidence is preliminary and single-site, which limits how much weight this match should carry.
- **Essentially identical** — [urban tree cooling primarily attributed evapotranspiration: the position stated and defended](https://conference-proceedings-track-b.fixtures.isthisoriginal.example/90424) (conference-proceedings-track-b.fixtures.isthisoriginal.example), label confidence 0.71
  The source advances the same position and the same proposed pathway, with a comparable practical recommendation. Its evidence is preliminary and single-site, which limits how much weight this match should carry.
- **Essentially identical** — [planting programmes budgeted canopy percentage would: the position stated and defended](https://conference-proceedings-track-b.fixtures.isthisoriginal.example/45470) (conference-proceedings-track-b.fixtures.isthisoriginal.example), label confidence 0.59
  The source advances the same position and the same proposed pathway, with a comparable practical recommendation. Its evidence is preliminary and single-site, which limits how much weight this match should carry.
- **Same position, different wording** — [Revisiting street-tree cooling dense cities driven mainly: a synthesis of the standard account](https://journal-of-applied-systems-review.fixtures.isthisoriginal.example/27489) (journal-of-applied-systems-review.fixtures.isthisoriginal.example), label confidence 0.87
  The source states the same central position in different vocabulary. It does not engage with the proposed mechanism, so the mechanism facet is untouched by this match.
- **Same position, different wording** — [Revisiting urban heat island street canyon geometry: a synthesis of the standard account](https://journal-of-applied-systems-review.fixtures.isthisoriginal.example/30546) (journal-of-applied-systems-review.fixtures.isthisoriginal.example), label confidence 0.86
  The source states the same central position in different vocabulary. It does not engage with the proposed mechanism, so the mechanism facet is untouched by this match.
## Closest model-generated matches
- **mechanism** — partial_overlap, level 0 (Produced directly by a basic prompt)
  The dominant explanation is a straightforward resource constraint: the observed effect scales with how much of the input is available, and most of the variation between cases is explained by that alone.
- **prediction** — partial_overlap, level 1 (Produced through repeated basic sampling)
  The usual explanation is historical path dependence: early choices locked in a configuration that is now costly to change, and the present pattern is largely inherited rather than chosen.
- **mechanism** — partial_overlap, level 3 (Produced only through multi-step reasoning)
  The unexpected consequence is that the most-funded interventions would be among the least effective, because they scale the wrong quantity.
- **mechanism** — partial_overlap, level 3 (Produced only through multi-step reasoning)
  If that holds, the practical consequence is that interventions should be targeted at the configuration rather than the total, which inverts the usual prioritisation.
- **prediction** — partial_overlap, level 3 (Produced only through multi-step reasoning)
  If that holds, the practical consequence is that interventions should be targeted at the configuration rather than the total, which inverts the usual prioritisation.
- **mechanism** — partial_overlap, level 4 (Reconstructable only after supplying key assumptions)
  Taking those assumptions as given, the strongest supported position is that the arrangement of the components, rather than their quantity, drives the outcome.
## Established elements
- The subject matter itself — urban heat island and street canyon geometry — is well covered in the retrieved sources.
- A retrieved source states substantially the same position: "urban heat island street canyon geometry: the position stated and defended".
## Uncommon elements
- The particular combination of concepts was not found stated together in the sources examined.
- The predictions drawn are more specific than those the baseline produced.
## Potentially original relationships
- The link between urban heat island and street canyon geometry via the stated mechanism was not found asserted in this form.
## Unsupported assumptions
- Facade thermal mass is a large enough share of canyon heat storage to dominate the night-time budget.
- Transpiration rates in street conditions are low enough not to offset the facade effect.
- Canyon geometry can be measured accurately enough to target planting by it.
## Suggested tests
- Design an observation that separates the proposed mechanism from the conventional account: find cases where the two predict opposite outcomes, and measure which occurs.
- Operationalise the stated prediction (Night-time cooling should scale with shaded facade area rather than with leaf area.) into a measurable quantity with a pre-registered threshold for what would count as disconfirmation.
- Identify a setting where the recommended action and the conventional action diverge, and compare outcomes there rather than on average.
- Search for the specific combination — urban heat island + street canyon geometry + longwave radiation budget — in sources this analysis did not cover: paywalled journals, books, non-English literature, and patents.
## Search limitations
- This run used fixture search results, not a live web search. The sources listed are illustrative examples on a reserved example domain and are not real publications.
- Paywalled journals, books, theses, patents, internal documents, conference talks and private correspondence were not searched.
- Non-English sources were not searched unless a query happened to surface one.
- Only the excerpt each result returned was read. A source whose relevant argument sits outside its excerpt would be under-weighted.
- Absence of a match is weak evidence. It means these queries did not surface a prior statement, not that none exists.
## Model-sampling limitations
- This run used fixture model generations, not live sampling. The baseline is a scripted stand-in that reproduces the shape of a real one.
- Level 5 means a facet was not produced during this analysis. It is not evidence that the model could not produce it — with different prompting, more samples, or a larger model, it might.
- The prompts are deliberately ordinary. A skilled prompter working deliberately toward this idea would very likely reach it sooner than this ladder suggests.
- Sampling is stochastic. Re-running the baseline would produce a partly different set of claims.
- Claims were clustered using a deterministic local embedding, not a trained embedding model. That groups near-identical phrasings reliably but will miss paraphrases that share no vocabulary.
## Provenance
```json
{
  "mode": "demo",
  "generatedAt": "2026-01-15T09:00:00.000Z",
  "analysisStartedAt": "2026-01-15T09:00:00.000Z",
  "analysisCompletedAt": "2026-01-15T09:04:00.000Z",
  "scoringVersion": "1.0.0",
  "search": {
    "provider": "fixture",
    "isFixture": true,
    "queriesPlanned": 14,
    "queriesSucceeded": 14,
    "resultsExamined": 58,
    "uniqueDomains": 11
  },
  "baseline": {
    "provider": "fixture",
    "model": "fixture-baseline-v1",
    "requested": 60,
    "completed": 60
  },
  "embeddings": {
    "model": "deterministic-local-v1",
    "isLearnedModel": false
  },
  "narrative": {
    "provider": "fixture",
    "model": null
  },
  "note": "Seeded example. Produced by running the real pipeline over fixture providers."
}
```
---
_IsThisOriginal estimates originality from the evidence it examined. It does not search all human knowledge and cannot establish that an idea has never appeared before._