Isometric 3D diorama of [scene, e.g. a tiny rooftop café with string lights and potted plants] on a floating square base cut away to show [cross-section detail, e.g. soil layers and pipes], soft clay-like materials, rounded edges, warm sunset key light, gentle ambient occlusion, pastel palette, true isometric camera at 30 degrees, centered on a plain [background color] background --ar 1:1 --s 250 --raw