海螺結構的靛藍藍曬

Use case: stylized-concept. Asset type: standalone 3:2 landscape case image. Primary request: a cyanotype study of spiral seashell sections and growth geometry arranged on deep indigo paper, no labels. Visual approach: stencil printing, 敘事場景版; keep the medium appropriate to the subject. Composition: one coherent scene, crisp material edges, believable spatial relationships. Constraints: no collage, no grid, no logo, no watermark, no readable text.

生成一張獨立的3:2橫幅案例圖：深靛藍紙上的海螺螺旋剖面與生長幾何藍曬研究，無標籤。視覺方法採用孔版印刷的敘事場景版，媒介須與主題匹配。保持單一連貫場景、清晰材質邊緣與可信空間關係；不要拼貼、網格、標誌、水印或可讀文字。