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 panoramic 21:9 dark studio photograph. A single long low triangular-section optical glass prism rests horizontally in the lower-right quarter, partly cut off by the right frame edge. A beam of actual white light passes through the prism, creating one very narrow slightly dispersed red-amber-green-blue spectrum on the charcoal tabletop directly below it, confined to the rightmost 36 percent. Prism is real clear uncolored glass with small machining imperfections, not a rainbow crystal. Left 60 percent and upper half remain uniform very dark charcoal. No glowing fog, neon ribbons or digital spectrum gradient. Quiet measured fine-art material photograph.