PromptA dramatic, vertical composition focusing on a highly polished, smooth obsidian sculpture. The sculpture rises elegantly from a bed of fine, matte black sand, occupying the central third of the frame. Delicate, cool silver edge lighting grazes the contours of the obsidian, emphasizing its glossy texture against the dark sand. The background is pure, deep black negative space. Photorealistic, high contrast, restrained palette of black, deep charcoal, and cool silver. Vertical 9:16 wallpaper; main subject in the lower-middle, quiet upper quarter for a lock-screen clock. Full-bleed artwork, no border, no frame, no text, no typography, no logos, no signature, no watermark.
