Artist Rebecca Adorno has created this wonderful art installation, based on anonymous letters written on her project blog. She writes:
The installation consists of five custom made string instruments and a type writer, which will act as an interface for the interaction. The typewriter will be wired in such way that each key will correspond to a servo motor and each servo motor will correspond to a string in the instruments.
Her blog is still open to submissions, and you can see additional photos of the piece here.