“By measuring a finger’s angle relative to the screen’s surface, the phone is able to register the x- and y-rotation of a touch. This opens a whole new dimension for touchscreens, and creates a richer vocabulary of interactions we can use on our ever-shrinking screens.”
Read the full article at: http://www.wired.com/2015/11/heres-what-real-3d-touch-looks-like/