This film is stripped of all content to create what is probably the most minimal work that still can confidently be called a film as it marries picture and sound by being either picture on or picture off and sound on or sound off. So in any given moment (frame) the film is in one of four possible modes: -) white frame, no sound -) white frame, white noise -) black frame, no sound -) black frame, white noise
Those are all the possibilities Kubelka gives himself to create excitement, anticipation, humor and many other things that cinema is capable of provoking. This is achieved by its unpredictability. When for example after a passage of rapid flickering a long passage follows that has just the black frame one waits for the flickering to kick in again. Or when after a long passage in which the sound is perfectly in sync with the flickering (eg white frame with sound on and black frame with sound off) it creates disorientation if suddenly this noticeable pattern gets interrupted.