黑白螺旋樓梯，把陰影當作實體

High-contrast black-and-white architectural photograph looking upward through a concrete spiral stairwell, smooth continuous handrail, a small circular skylight, alternating luminous steps and deep shadows, controlled perspective and crisp concrete grain, no people, symmetry with subtle structural rhythm. Square 1:1 standalone finished image. No text, logo, watermark, border, grid, multi-panel layout or contact sheet.

向上仰拍混凝土螺旋樓梯井的高對比黑白建築照片，連續光滑扶手、小圓形天窗，明亮踏步與深影交替。透視受控，混凝土顆粒清楚，沒有人物，對稱中有結構節奏。 方形1:1獨立完整成圖。不要文字、標誌、水印、邊框、網格、多格排版或聯絡表。