プロンプト

Austere spatial realism of a subterranean museum carved into a rocky plateau, viewed upward from the interior toward a perfect circular skylight framing clear sky, with monumental stepped galleries hewn from rough warm-gray stone, a single shaft of midday light washing across the surfaces, and subtle glimpses of sparse lichen-green alpine vegetation at the rim; primordial, contemplative, geometrically precise, restrained detail, controlled visual noise, no text, watermark, logo, border, UI, or interface elements.

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