矿物展览海报底图
用颜色与几何体建立视觉焦点，留出可后期排版的区域。
Make a clean editorial photograph for a minerals exhibition poster. Compose a charcoal basalt cube, a small polished silver sphere, and one large folded sheet of rust-red paper on a saturated cobalt backdrop. Place the objects in the lower two-thirds, with clean negative space for a headline. Give each material a readable texture, use a controlled hard key light, and leave the background unbroken. Do not draw typography, logos, or borders.