The Xylophone-Marble-Instrument-Movement is developed out of a Listening exercise! We listened to marble recordings and kids did draw their own instruments. Then we met after school voluntarily to built such instrument. Here the first results. We will furthermore work on a video about that process and will edit and improvise in software with the audio recordings. We also plan to built in collaboration with a sound artist built such instrument into nature, made of wood and metal. This is a long term project of Hai Art.