地下展示室内部：天窓、石灰岩、静かな繋がり

Design a museum expansion interior inspired by the Saint Louis Art Museum East Building. Create naturally illuminated underground galleries with skylights, limestone walls, oak detailing, flexible exhibition halls, open circulation, and quiet contemplative spaces. Prioritize spatial continuity, subtle daylight, museum connectivity, and timeless material expression. A gallery lit entirely by a coffered ceiling of deep square skylight wells, each well lined in dark polished concrete so the light arrives soft and directional, pale limestone walls, oak floor, artworks spaced generously apart, no artificial light in use, calm even daylight, wide eye-level view, 28mm lens, interior photography, ultra photorealistic, 8K