A breathtaking split-view illustration showing the world above and below the water surface of a magical coastal tide pool at golden hour, the composition divided perfectly in half horizontally — the top half showing a warm amber and rose sunset sky above a rocky coastal shoreline, rounded mossy sea rocks covered in tiny anemones and barnacles, cheerful little crabs picking their way between the rocks, sea grass and small wildflowers growing in the crevices catching the last warm light, the surface of the water in between shimmering and refractive like liquid gold catching the sunset — the bottom half revealing the secret world beneath, a lush miniature reef of colourful coral, sea anemones with waving tentacles in pink and orange, a small friendly cartoon fish with big curious eyes swimming right up to the viewer, a tiny seahorse clinging delicately to a piece of green sea grass, a round cheerful hermit crab carrying a beautiful painted shell, clusters of luminous pearls and tiny glowing sea urchins scattered across the sandy floor, the whole underwater portion bathed in that magical amber-golden light filtered down from the sunset above, the mood whimsical warm and full of hidden wonder like a storybook illustration, Pixar-quality painterly 3D illustration, ultra highly detailed, beautiful, rich warm palette, soft golden atmospheric light above and below, wide 16:9 desktop wallpaper composition, no people, no text, no logos, the full width richly detailed and balanced