都市机器：外露设施与可变空间

Design a public cultural building functioning as an urban machine with exposed infrastructure, adaptable spaces, transparent facades, and strong civic engagement. Blur the distinction between architecture, infrastructure, and public space. A building whose entire ground plane is an open public square continuing under the structure, exposed servicing overhead, moveable exhibition walls currently in one arrangement, crowds passing through freely, late afternoon light, eye-level composition, 24mm lens, ultra photorealistic, 8K