Gilda Negrini and Riccardo Vendramin, two young product designers from Italy, worked on this project during a course at Politecnico of Milano. It’s called MusicInk, it runs on an Arduino Duemilanove board, and gives an alternative method to teach music to children. That’s how they describe it: "MusicInk makes drawings turning into real music, this magical process is due to a mashup of various eterogenous technologies...". MusicInk spawned from the idea of looking into the world of music teaching, creating a new way to understand music and interact with musical instruments. MusicInk is a toy that leads you to an innovative approach to music, allowing children not only to draw musical properties, but also to turn them into a real symphony. This project main characteristic is the use of a unique electrically conductive paint that allows children to play their own drawings.
-- from the Arduino blog
-- go to Musicink website