Prompt

Industrial science-fiction 3D concept art of a colossal mechanical iris opening above a luminous reactor inside a circular subterranean machine vault, shown in a perfectly symmetrical frontal view with concentric machinery radiating from the center. Burnished copper, teal green, and charcoal palette; intense reactor glow rises through cool overhead darkness, creating a monumental, tense atmosphere with controlled visual complexity, crisp mechanical detail, and no text, watermark, logo, border, UI, or interface elements.

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