Two Found Objects of Charles Boultenhouse 1996 on netflix

A thin oval of green-tinged light in thick darkness persists, then gradually descends below the bottom of the frame and, after a pause, rises again to its original position. Out of the surrounding darkness a figure slowly emerges, a woman in a purple robe who moves with stately steps back and forth across the screen, finally fully apparent in the “line” (or circle) of light. She throws off her robe and appears in her white shift, lies prone upon the floor, then rises into a dance of rhythmned postures which subside to a kneeling and bound-down position from which she retrieves her robe, enrobes herself again, circles the “pool” of light and is obliterated by four yellow flashes of light (simultaneously, at the four corners of the frame).