Envision a grand Gothic cathedral on the riverbank of a bustling Metropolis, rendered in a fusion of artistic styles that evoke the work of Edward Hopper, Gustave Doré, and Moebius. The cathedral, central to the composition, is bathed in sepia tones, drawing a vintage vibe that mixes 1930s science fiction with Art Deco elements. Above it, a large, mesmerizing circular sun casts a warm glow, complemented by golden lines that suggest a mandala-like aura, further accentuating the surreal, dreamlike quality of the scene. The river below curves into an S-shape, adding a dynamic movement to the entire scene. This collage art style, intricately detailed and harmoniously balanced following the golden ratio, could serve as a masterclass in how to create high-end AI art, blending historical architectural elegance with imaginative, futuristic concepts.