The Engadged title says it's a violin, but it the fact that they built each note on it's own makes me think of it as a piano, or some other hammer/string instru

The Engadged title says it's a violin, but it the fact that they built each note on it's own makes me think of it as a piano, or some other hammer/string instrument. It's neat that they can modify the damping factor by changing the vacuum/pressure within the instrument chamber.