Vertical 4-panel grid split, showcasing four distinct wood surface textures. Top panel: smooth polished dark walnut wood with rich natural grain lines and a soft satin sheen. Second panel: aged sun-bleached barn timber with deep raised grain, splinters, and weather-worn cracks. Third panel: charred Shou Sugi Ban timber displaying a glossy carbonized alligator crackle pattern. Bottom panel: rough-hewn raw oak beam showing coarse saw blade marks and natural knots. Macro detail photography, side lighting emphasizing depth., Trigger Words: real_surface