A surreal retro-futuristic vision of a floating cosmic opera house drifting quietly amongst glittering asteroid fields and pastel nebula formations. The majestic structure, composed of polished marble and gilded metal, features elegant balconies, ornate chandeliers glowing softly with cosmic energy, and a stage illuminated by prismatic beams of celestial light. Performers adorned with reflective vintage garb and intricate masks gracefully present a mesmerizing spectacle, manipulating holographic star patterns and nebulae with their movements. Rendered with cinematic expansiveness, delicate airbrush gradients, and rich contrasting hues of warm gold, sapphire, coral, and amethyst, capturing the nostalgic essence of mid-20th-century surrealist cosmic artwork. <lora:retro-futurist-cosmic-surrealism-flux:0.75>