Depending upon the type of material, the tone will change when you strike it. I still think it's a mistake to say that this turns a surface in to a "multitouch"

Depending upon the type of material, the tone will change when you strike it. I still think it's a mistake to say that this turns a surface in to a "multitouch" surface, because of the vast differences between this and what has commonly been referred to as multitouch. Again, extremely cool technology, but you couldn't for example, attach a microphone to a wall and couple this with a projector to control the OS. That's the inference that gets drawn when you say "multitouch".