Virtual reality has finally delivered on its promise: You’re completely immersed in a game, oblivious to the outside world, totally at one with the virtual environment. Until, that is, you walk into a real-world wall. Or spill your drink. Or step on your cat’s tail. Suddenly, you’re scrambling to remove your VR headset and get back into actual reality. The spell is broken and you’re standing in a puddle of soda, nursing a bloody nose, or sticking your head under the couch and begging kitty to forgive you. And you didn’t even get to save your progress.