Frame the silhouette of a lone figure gazing out at a breathtaking cityscape from a rooftop. The city stretches before them, with towering skyscrapers reaching for the sky. Use a long exposure to blur the lights of the city, creating a soft, ethereal glow. Focus on the contemplative expression of the figure, their thoughts reflected in the vibrant skyline. Capture this scene with a full-frame DSLR camera and a telephoto lens to compress the perspective and emphasize the silhouette. For a 4K wallpaper, enhance the contrast between the dark silhouette and the bright city lights, creating a striking and dramatic effect that showcases the beauty of urban landscapes and the peaceful solitude they can offer.