{
  "schema": "auturnal.concept-cover.v1",
  "slug": "photonic-inverse-design",
  "tool": "ImageGen built-in",
  "prompt": "Use case: stylized-concept. Asset type: premium wide scientific editorial cover for Auturnal. Subject: A precision nanophotonic chip as dark teal crystalline slab with an intricate ivory etched channel, amber light splits into three clean waveguide paths, beautiful close macro conceptual photonic engineering. Museum-quality editorial scientific art with elegant sculptural realism, a single striking coherent focal concept, subtle material grain and atmospheric depth. Restrained ivory, warm amber/copper and dark petrol palette, beautiful natural directional light, sophisticated uncluttered 3:2 landscape composition. No text, labels, letters, numbers, logos, watermark, charts or fake research data. Conceptual illustration; do not imitate a published observational figure.",
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  "original_dimensions": [
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  "conceptual_illustration": true,
  "experimental_result": false,
  "processing": "Lanczos resize and WebP encoding only; original generated PNG retained at tool output path.",
  "cover": {
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    "width": 1200,
    "height": 800
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  "thumbnail": {
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