Leap Motion Controller
Used by 2 peopleultraleap.com ↗

“Call me a luddite, but touchscreens and even touchless interfaces like Leap Motion leave me a bit cold; a physical push button, slider or knob is a wonderful thing to touch, especially when it 'magically' controls an explosion of digital colour and sound.”
Alex Evans Interview, Co-founder of MediaMolecule (LittleBigPlanet) · via Uses This