Here are pyrotechnics of the keyboard, but with only a camera to "play the tune." To make this film, Norman McLaren employed novel optical techniques to compose the piano rhythms of the sound track. These he then moved, in multicolor, onto the picture area of the screen so that, in effect, you see what you hear. It is synchronization of image and sound in the truest sense of the word.
-- DESCRIPTION FROM UBUWEB
An updated version of this type of work for VGA signals:
http://www.youtube.com/watch?v=uykOoQkkamo
A circuit driven by feedback loops produces frequencies that can be heard and seen on a VGA based video display. The link between image and sound is recursive; the audio and video signals are derived from a single source and recirculated through an outboard mixer. The sound is a direct translation of electronic signals into audio and the video synchronization signals, which allow the image to be seen, influence the types of pitches that are produced.
More tech info and images:
http://www.flickr.com/photos/phillipstearns/sets/72157624352958533/
This is what my eyes do when I look at a Barnet Newman painting
and instead we live in the ideal and fantasy of what Summer becomes. We anticipate this time of year with a child like earnestness and we willfully throw ourselves into a haze, from which we slowly find our way back into reality.