A couple of decades ago one of *the* smartphone accessories to have was a Bluetooth keyboard which projected the keymap onto a table surface where letters could be typed in a virtual space. If we’re honest, we remember them as not being very good. But that hasn’t stopped the idea from resurfacing from time to time.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/03/12/this-piano-does-not-exist/