Sure, people can wax poetic about using HTC's Vive virtual reality headset, but what's it really like when you're looking through those lenses? You might not have to make a pilgrimage to one of HTC's tours to find out. ValveTime has posted a video walkthrough of Valve's Portal-themed VR demo (used on the Vive since this spring), and it gives you a good sense of what the immersive, room-based experience is like. To put it mildly, this is a tantalizing glimpse of what VR can do for gaming -- you can explore every nuance of an Aperture Science workshop, pulling drawers and levers almost like you were there. We don't want to spoil the whole thing, but it's safe to say there are robots and a few signature Valve surprises. Can we have a full-fledged title based on this, please?