Prompt:
A fantastical digital artwork depicting an enormous circular structure resembling an ancient, steampunk-inspired sundial or celestial portal. The central focus is a massive, detailed moon-like sphere with visible craters and textured surface, positioned within the intricate circular mechanism. This central planet is surrounded by concentric rings of complex gear-like structures, mechanical parts, and ornate designs, all in metallic blue and bronze tones with hints of rust. The outer ring features numerous gears, latticework, and decorative elements, including miniature buildings, spires, and arches. The structure is partially covered in overgrown vegetation, adding to its aged and mystical appearance. The foreground consists of a rocky terrain with scattered boulders and stones in dark gray and brown hues, leading to a small central platform at the bottom center. On this platform stands a tall, dark structure with a pointed top, possibly a tower or dome, emitting a bright golden light that illuminates the surrounding area and creates a striking contrast with the dark environment. The background showcases a deep midnight blue night sky filled with stars, nebulous clouds, and distant celestial bodies, creating a sense of vastness and otherworldliness. The lighting is low-key with high contrast between the bright light emanating from the central structure and the dark surroundings, emphasizing the mysterious and ethereal mood of the scene. The color palette includes midnight blue, metallic blue, bronze, black, and amber yellow, with high saturation and low luminance except for the highlighted areas. The overall composition is symmetrical and centralized, drawing attention to the intricate details of the mechanical structure and the cosmic elements surrounding it, evoking a sense of wonder and otherworldliness typical of 4K resolution digital art.