Today, if you want to experience virtual reality, you have two options. The first is mobile VR, which uses a relatively cheap headset paired with your smartphone screen to offer a somewhat immersive experience but without the ability to get up and move around inside the virtual world. The second is a high-end headset like Facebook’s Oculus Rift or HTC’s Vive. These expensive products do allow you to move around within the virtual world thanks to positional-tracking technology in the headsets that work in conjunction with external sensors mounted on your wall — but your range of movement is limited.