Use case: photorealistic-natural. Create ONE finished photographic website background for a coherent collection named Prism studies. Premium material still-life photography of real thick optical glass and physically believable refracted sunlight, captured on a medium-format camera. Architectural restraint and tactile detail: small irregular air bubbles within cast glass, fine moulded ribs where specified, plausible beveled edges, dense colored edges, subtle surface imperfections, contact shadows, realistic internal reflections and luminous but controlled caustics. The glass must look photographed, never glossy CGI, a plastic render, a generic abstract blob, a torus or a floating chrome object. Color comes from the glass and light, never an added digital gradient or haze. Deliberate asymmetric composition, no unnecessary props, no vase, no flowers, no sphere, no letters, typography, logos, watermark, browser, UI, border, collage, contact sheet or people. Output ONE standalone edge-to-edge image in the stated aspect ratio, using the highest native detail available. Preserve the requested calm copy space; keep sharp visual detail and bright caustics out of it. Scene and framing: A portrait 3:4 studio photograph. A thick transparent cobalt glass slab rests at an angle in lower-left, partially cropped by the left and bottom edges. Its uppermost corner reaches 51 percent down the frame. The asymmetrical faceted cut is architectural and simple, no gemstone shape. One warm reflected edge and a restrained blue refraction along the lower table surface reveal solid physical glass. Top 45 percent near-black charcoal and quiet. Premium optical still life, real microtexture and shadow contact, not a luminous fantasy crystal.