地下增建：绿屋顶、下沉庭院与景观广场

Design a museum extension inspired by David Chipperfield. Integrate underground exhibition spaces, green roofs, landscape plazas, sunken courtyards, educational facilities, and restrained architectural detailing into a cultural institution emphasizing continuity, permanence, and environmental sensitivity. A grass plaza with only a low stone parapet and a rectangular void revealing a sunken courtyard below, the entire gallery volume buried beneath the lawn, a broad flight of stone steps descending into the void, mature planes framing the plaza, the historic museum standing intact behind, soft overcast light, elevated view over the void, 28mm lens, architectural photography, ultra photorealistic, 8K