Viola Organista - Leonardo Da Vinci's take on a piano

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With elegant black and tan keys, it looks just like a baby grand piano.
But when the instrument's keys are stuck, they release the distinctive sound of a cello.
The remarkable creation is the viola organista - which was originally designed by Leonardo da Vinci in the late 15th century, but never built.
Now, hundreds of years later, it has come to life thanks to a Polish concert pianist with a flair for making instruments.

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