In virtual reality games (as in most games), your hands are what you use to interact with your environment, either directly or mediated through some virtual object (like a gun or a sword). But the experience of doing this is almost completely a one-way street: Maybe the controller that you’re holding is fancy enough to vibrate a little bit, but that’s about the best that you can hope for in terms of the interface physically stimulating you. For a more immersive experience, you want to engage as many of your senses as possible, not just sight and sound.
Besides incorporating motion into VR, adding convincing haptic feedback is the next logical step. It’s a difficult step to take, though, because there’s no obvious way to exert force on a handheld controller so that it feels like it’s responding to the game while it’s in your hand. But Tactical Haptics thinks it has the problem licked. It has spent the past few years developing a clever controller that can buck and twist while you’re holding it.