Homo Sapiens, showing at Cornell Cinema on September 6, opens with a drenching view of what Ithaca lacks: rain. Not the misty sort of showers that ironically serve to heighten the humidity but the real wet drops of purifying, sustaining rain. From this point, director Nikolaus Geyrhalter spans from one scene to another, each averaging about 26 seconds with a different naturalistic soundtrack of birds, bees, breezes, blizzards and beaches. Intermittent power outages — in which Geyrhalter cuts to black — provide the only pauses from one still life to the next. In its human-free view of the world, Homo Sapiens presents a powerful glimpse of our ethereal human legacy.