It sounds simple, and that's because it is. But it's also mesmerizing: as you type, different animations appear on the screen.
The site was made by designer Jono Brandel, in collaboration with music composers Lullatone; he describes the site as being a portable animation sound kit."
Lullatone created sounds to accompany different animations. There are different color palettes, each with its own unique set of sounds. The sounds are aimed to make tapping as melodic as possible; it's like a visual drum pad.