A flutter is also a visual cue used in film music scoring. It is a group or cluster of three to seven visual "punches" (in film a punch is a small circular flash in the film made by literally "punching" a hole in the film) with each punch separated by an unpunched frame thus producing a flicker effect over the picture. Typically, a flutter is placed on the downbeats of specified bars of music to provide a "visual metronome" for the conductor so that he or she can, in conjunction with streamers, correctly pace the performance of the music to be sure that the length of the music and the events in the music end up matching the picture as compositionally intended as the performance proceeds.