I've always had mixed feelings about touchscreen buttons: they're infinitely versatile, allowing buttons to appear, disappear, and change for each specific situation. But the cost is that we abandon one of our five senses, as touch becomes useless to guide our fingers or feel the tactile force and click of the button. Tactus Technology wants to bring that sense back to touchscreens, with an overlay that allows buttons to physically morph up out of the display on demand. This is different from other haptic technologies, which use electrical or vibration feedback to simulate the feel of a button click - unlike those, this allows the buttons to be located with the sense of touch before being pressed. In fact, this seems pretty close to the ideal improvement that could be made to touchscreens. The only question is how well Tactus can make it work!