A massive ancient spiral seashell hovers impossibly in a surreal twilight void, its interior transforming into an infinite cosmic ocean where translucent marine beings in flowing bioluminescent robes swim through corridors of liquid starlight, shell ridges becoming cascading staircases spiraling toward twin crescent moons made of solid silver, deep ocean sapphire and luminous pearl palette, soft phosphorescent glow from bioluminescent currents, ethereal mystical wonder mood, Dali meets Magritte impossible physics, photorealistic 8k rendering