Way more than an ordinary player piano, this incredible contraption is called the Hupfeld Phonoliszt-Violina. It can play a set of three violins using a special rotating circular bow, and dozens of mechanical “fingers” which press on the strings. More here and here.
YouTuber Mike Boyd takes on one of the most daunting instruments to pick up. The violin sounds distinctively annoying in the hands of a rookie, but Mike quickly figured out a basic tip: it’s all in the grip. And the time you put in. Here’s what 13 hours of practice sounds like.
So your buddy is complaining that their seedless watermelon has a seed in it. How do you respond to their whining? Whip out two fingers and play them a sympathy tune. Now, thanks to Design I/O and Project Soli, your fingertips can actually make the sounds too.