Until very recently I had never heard of this instrument before, yes, this is an actual instrument.
It is called the theremin, an instrument that is controlled without contact from the player.
Yes, this is true.
It is named after its Russian inventor, Professor Léon Theremin, who patented the device in 1928, making it one of the earliest electrical instruments. You control pitch and volume by positioning your hands close or away from the antennae.
I fell in love with this instrument after watching this video:
I am sure you, as I, will want to get one after watching that.