Well, it is "almost" a spintop musical instrument. Unfortunately, the tops are hanging from wires.
The paterns on the paper are made with conductive ink. The top closes the circuit of some signal generator.
It wouldn't be difficult to make a real spintop instrument by replacing the wire with a proximity sensor (capacitive, inductive or magnetic).
Hey, if you have a theremin at home, you only need to put nearby a top with some conductive surface and a crooked tip so it dances around.
