The theremin is an early electronic instrument that is played without physical contact.

It was invented by Leon Theremin in 1920, and it uses two antennas to detect the player's hand movements, controlling the pitch and volume of the sound produced.

One interesting fact about the theremin is that it was the first instrument to be played without being touched, and it was also the first electronic instrument to be used in classical music compositions. https://www.youtube.com/watch?v=ajM4vYCZMZk