Here is the explanation directly from the creators website-
MusicInk is an educational toy whose main characteristic is the use of an electrically conductive paint that allows children to play their own drawings.
MusicInk is an educational toy designed for children between the ages of 4 and 7 years.
MusicInk has been created to be the first of three different kits dedicated to the different stages of learning of children.
The first kit is dedicated to children who approach for the first time the music world, so it is designed to teach the basic properties of sound through fun exercises.
The properties of sound that will be dealt with are: pitch, intensity, duration, timbre and DO scale.
Link to Page: