Check out this holo pushbutton from VTouch

VTouch won a #CES Innovation Award for this holographic pushbutton. Check out how it works. Holo Button by VTouch Inc., is a product that floats a real hologram in the air and detects contact with a distance sensor to use as a button or switch. It is easy and intuitive to use because you touch the hologram that exists in the air (not ambiguous like a proximity sensor). It increases accessibility by placing the hologram within the user's reach when the button is out of reach. It is hygienic because there is no physical contact.