Virtual reality is a strange place to visit, particularly when that virtual reality is a mountain you’ve never been to in person. At CES this week, NVIDIA showed off the HTC Vive Pre VR headset with a Mount Everest demonstration -- that is, a snowy digital landscape very carefully created to simulate the real thing, tents and all. Of course, imparting the climbing experience in virtual reality is not really possible, at least not in the absence of a stepping machine and air conditioner. Making you feel as if you might plunge down an icefall abyss, though? They nailed that part.