MIT is showing its advances in 3D gestural computing with a bi-directional monitor: it senses your hand movements, and then directs the computer to move the 3D model. (Optical sensors are embedded behind the LCD screen.)
…gestural interfaces, which would, for example, allow computer users to drag windows around a screen simply by pointing at them and moving their fingers, or to rotate a virtual object through three dimensions with a flick of the wrist.
Gestures would certainly solve one problems created by touch screens (greasy glass) but not the other one, tired arms.
Photos and more info in MIT News: Computing with a wave of the hand.
