Explore a vast, intricate universe encased within a crystalline sphere, each layer revealing its own distinct world. At the outermost level, vibrant forests and cascading waterfalls blend seamlessly into an awe-inspiring skyline. Descend deeper, and discover a mesmerizing cityscape where futuristic architecture meets nature, illuminated by bioluminescent flora that thrives in harmony with advanced technology. Delve further to uncover a subterranean ocean teeming with fantastical creatures, their luminescent trails weaving patterns in the inky depths. This epic, hyper-realistic scene harnesses the power of Unreal Engine 5.2, rendering every detail in stunning 8k quality, from the shimmering glass surface to the intricate life forms evolving within each sphere.