It is funny to see this because a few years ago in college I mused with the idea of using bubbles for buttons on screens and drew up some plans I had. I didn't have the tech or the time to bring it about, but I am glad someone else has. The issues I came up with was how to build a small pneumatic motor that would fit in a device, not make much noise, work quick, and not drain all the power fast. I hope they can do it becasue tactile feedback would be nice. =)