BallDroppings is a noisy play-toy. It can also be seen as an emergence game. My brother Marc takes this software seriously as an audio-visual performance instrument. Balls fall from the top of the screen and bounce off the lines you are drawing with the mouse. The balls make a percussive and melodic sound, whose pitch depends on how fast the ball is moving when it hits the line.
Note: When you run this program, your screen will turn completely black. Start clicking around. Make sure the computer's sound is on."