Theremin

Russian engineer Professor Leon Theremin performs on his invention, the ‘Thereminvox,’ New York, New York, 1920s or 1930s. (Photo by Soibelman Syndicate/Visual Studies Workshop/Getty Images)
Russian engineer Professor Leon Theremin performs on his invention, the ‘Thereminvox,’ New York, New York, 1920s or 1930s. (Photo by Soibelman Syndicate/Visual Studies Workshop/Getty Images)
Image: Getty Images/Visual Studies Workshop