A triple exposure means there are three separate
shots of Mary on one frame of film. It was all done with the camera
(no computers used), on location, in roughly 30 to 40 minutes.
I started by shooting Mary at the end of the piano, because
this was the one location where her eyes would be plainly visible.
If this shot was done last, an unfortunate "blink" at that time would have
meant shooting it all over again. With the other two poses a blink
wouldn't have mattered that much. For the first shot, a black cloth
covered the music rack and keyboard because I didn't want either of these
to show yet. I then uncovered the music rack and left the keyboard
covered, along with the end where she was just resting her arms, and, after
she climbed up onto the piano, took the exposure of her turning her own
sheet music. Covering the rack again, but exposing the keyboard while
Mary changed, set the stage for the final shot.