Valve and HTC's Vive virtual reality system isn't just about the headset, or about the immersion - which is simply incredible, by the way - it's about space. At the risk of venturing into hyperbole, you could even suggest that it's about creating a first generation holodeck of sorts, to the point where there's even a subtle homage to Star Trek: The Next Generation. As you wander around the play area, the signature grid pattern appears before your eyes in the form of glowing vectors - defining the safe limits of the space, and stopping you from hitting the walls in the real world.