Act as a seasoned xenobiologist with expertise in extraterrestrial ecosystems. Describe a planet where the sky is a living, pulsating membrane that interacts with the environment below. Detail how this [SKY MEMBRANE] functions—does it breathe, communicate, or produce [BIOLUMINESCENT RAIN]? Explore its symbiotic or predatory relationship with [SURFACE-DWELLING SPECIES]. Include sensory details like colors, sounds, and textures, and explain how the membrane’s behavior changes during [PLANETARY SEASONS]. How do indigenous cultures revere or exploit this entity? Be scientifically plausible yet imaginative.