悬垂的混凝土帆：两根柱子之间的薄膜

Design an exposition pavilion in the manner of Álvaro Siza's Portuguese Pavilion — a ceremonial plaza covered by an extremely thin reinforced concrete sheet that hangs in a shallow catenary between two heavy porticoes, sagging under its own weight like a cloth pinned at two edges. Compose a vast rectangular canopy curving down in the middle, only 200 millimetres thick, springing from two massive stone-clad piers, thick steel cables visible where the sheet meets the supports, an empty paved plaza beneath, water beyond, hard bright light with deep shade under the sag, low wide view, 24mm lens, architectural photography, ultra photorealistic, 8K