Patatap is an online “animation and sound kit.” You can create sounds and moving shapes either by using the space bar and typing on the keyboard or tapping the screen on a mobile device. (Warning: contains flashing images)
A related project is Typatone. By typing on the keyboard, you can create music. “The act of writing has always been an art. Now, it can also be an act of music.”
Both were created by computer programmer Jono Brandel and the Japanese electronic duo Lullatone, consisting of Shawn James Seymour and Yoshimi Tomida.