I had a little epiphany while shooting zombies in a demo that virtual-reality startup Survios staged. I could point my guns in different directions, like a hero in a John Woo action movie, shooting enemies that were coming from all sides. That was something I could never do in a video game, where I would have to point my guns forward at the limited field of view in a TV screen. Virtual reality delivered an experience that I couldn’t get any other way. And that’s pretty cool.