Rolling a light-ball changes its color and sound. Combined, the light-balls form an orchestra! 

The overhead light-balls communicate with those on the floor, as one is touched,  the surrounding balls will be affected, changing the color of the entire space. Roll the light-ball in front of you and it will change color and release sound. In the same space participants use their bodies, interacting with the light-balls to change the color of the space and to make music.