移動と更新の都市ユニット：着脱可能なフロア構成

Design a metabolist office block in the manner of Kiyonori Kikutake where permanent concrete cores carry temporary lightweight floors, and one bay is deliberately shown mid-replacement with a floor unit missing and its connections exposed. Compose two heavy concrete shafts, stacked pale metal floor trays between them, one gap open to the sky with visible steel brackets, a crane arm at the edge of frame, plain city street below, flat neutral daylight, low three-quarter view, 28mm lens, architectural photography, ultra photorealistic, 8K