A. GOAL vs RESULT Intended: Compress 300 million years of a two‑galaxy collision into one frame where tidal tails, starbursts, and gravitational chaos become a dance of mutual destruction and rebirth. The emotional target was the vertigo of time, violent beauty, inevitability; the test asked whether adding a single palette word (“phosphorescent green”) improves ontology_match without hurting prompt_effectiveness. Produced: - Image 0 (control, no green): A strong pearlescent tidal ribbon with bead-like clusters and ember-lit obsidian “cores,” plus a top star ring and a prismatic crystal. The merger reads ambiguously: it can be parsed as a planetary still life or ring galaxy rather than two galaxies colliding. - Image 1 (with “phosphorescent green”): Two overlapping disc-like cores with a razor-thin seam, a chalk-white tidal ribbon, and explicit phosphorescent green/cyan tidal tails; but also extraneous ornamental forms (metallic torus, perforated lattice) that interrupt austerity. Outcome: The thesis comes through clearly in Image 1 via the near‑kiss seam and tidal tails; the addition of “phosphorescent green” modestly improves ontology_match without major degradation in prompt_effectiveness. Image 0 is aesthetically strong but conceptually ambiguous. Emotional aims partly land in both; inevitability is better argued by Image 1’s seam; vertigo is moderate; violent beauty is present via fractures and seam lighting. B. GAP IDENTIFICATION - Image 0: The “two galaxies colliding” structure is not explicit. The top ring plus multiple “core” spheres and a prismatic crystal produce a jewelry-like still life. The seam operator is absent, weakening inevitability and temporal compression. - Image 1: The seam and tidal morphology succeed, but “phosphorescent green” pushes toward neon, and the scene accrues ornamental artifacts (torus, lattice) that dilute the meditation and palette intent (CMB pastels). - Investigation question: Ontology_match improved modestly in the green variant (seam + tidal tails read), and prompt_effectiveness remained solid, but visual purity suffered due to object clutter. Where the chain broke: - Concept→Prompt: Partially sound (seam, tails encoded in nebula_2). However, palette language (“phosphorescent”) conflicts with the intended subtle microwave pastels. - Prompt→Image: The “gem/crystal/iridescence” lexicon triggers jewelry artifacts (prism, torus), and the green cue becomes overassertive, pulling the model toward decorative sci‑fi tropes. - Concept itself: Sound; compositional operator (razor seam) proves effective when present. C. ROOT CAUSE - Overloaded noun inventory and gem lexicon (“crystal,” “prism,” “pearlescence,” “gem-like”) encourage the model to introduce jewelry-like objects unrelated to the collision thesis. - The palette adjective “phosphorescent” steers toward neon/tech glow rather than the intended CMB subtlety, increasing visual noise. - Absence of explicit negative constraints permits ornamental forms to i