In the biopic of the musical legend Mozart, 'Amadeus,' the glass armonica is featured to showcase Mozart’s fascination with unique sounds. Invented by Benjamin Franklin, the glass armonica consists of a series of glass bowls of graduated sizes on a rotating shaft, played by touching the rims with wet fingers. The instrument produces a pure, 'ethereal' tone that was once believed to cause madness in players and listeners. In the film, it represents the 'divine' quality of Mozart’s music. Its inclusion helped the audience understand that Mozart was not just a traditional composer, but an innovator who sought out legendary new textures. The instrument’s haunting sound remains one of the most distinctive elements of the film’s celebrated soundtrack.