[1]

“This work combines a real grand piano and computer generated moving images. A
player can compose simple melodies visually using a trackball interface to position and place »dots« on a moving grid on the lower projection screen. These dots constitute a virtual score, which triggers the piano keys, which in turn project computer-generated images on the upper screen. In this way the piano itself seems to become transformed into image media – a flow of image depresses the piano’s keys, which as a consequence release yet another flight of images.”[2]

[1] http://deodesign.files.wordpress.com/2007/10/119.jpg

[2] http://on1.zkm.de/zkm/stories/storyReader$5794