CUBE is a short cinematic sci-fi teaser set in a future where humanity survives inside massive cube megastructures after Earth becomes environmentally uninhabitable. The idea came from a concept I had imagined for years and always wanted to visualize in a cinematic way. I wanted the world to feel atmospheric, grounded, quiet, and emotionally restrained rather than like a traditional sci-fi action film. The teaser starts with a peaceful vision of Earth and slowly reveals that nature only exists as a projection inside a brutalist megastructure. Everything was built entirely inside Melius using image generation, image-to-video workflows, stitching, refinement, and cinematic worldbuilding.