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Would the bubble create a non touch sensitive surface, since it is at a distance from the screen? Assuming it can be pressed flat against the glass before the touch screen beneath detects a touch, you have pretty much what you want.

There would still be touch sensitive areas between the bubbles, which might be a problem, depending on the app.

Exactly. My first reaction was "Okay, my mind is thoroughly blown." ...then my second thought was "wait, feeling around a bumpy touchscreen will just lead to more accidentally pressed keys unless they don't trigger until they're pressed down"

agreed, feedback is vital