At GDC 2013, a company called Tactical Haptics showed off a tactile-feedback system, called Reactive Grip, for motion-controlled input devices. The prototype I got to use consisted of a hacked up Razer Hydra built into a 3D printed housing with four sliders that move up and down in your hand as you grip the unit. For certain situations, like swinging a sword or flail, the system creates an impressively convincing sensation that could bring us one step closer to immersive virtual reality.