Leonardo da Vinci designed the viola organista by combining bowed strings with keyboard action.
The instrument appears in Leonardo’s notebooks in several forms, with designs dating from the late fifteenth and early sixteenth centuries. A keyboard controlled the notes, while rotating wheels or a continuous bowing mechanism rubbed the strings. This arrangement aimed to produce a sustained, string-like sound without requiring a musician to bow each string directly.
The viola organista was never built during Leonardo’s lifetime, and surviving drawings do not specify one final standardized version. Its name is modern and reflects the hybrid character of the idea: it was neither an ordinary viola nor a conventional organ. Later instrument makers created reconstructions, including a playable version built by Polish musician Sławomir Zubrzycki and presented publicly in 2013. The design belongs to Leonardo’s broader interest in mechanics, acoustics, and the practical workings of musical instruments.