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Baroque fantasy illustration of a spiral library carved inside an enormous fossil shell, shown in a symmetrical cutaway view centered on ascending shelves and a circular atrium, within a subterranean cavern of suspended dust and mineral pools. Precise ornamental detail, antique copper, deep turquoise, and parchment white palette, warm lantern light reflected by cool subterranean water, scholarly and enchanted atmosphere, controlled visual noise, no text, watermark, logo, border, UI, or interface elements.

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