Virtual reality has to be personally experienced to be understood and appreciated, but it's not exactly the most accessible thing at the moment. Both in terms of equipment as well as content. Google Cardboard solved half the problem by making it almost too easy for anyone with an Android phone to get a cheap VR headset. WebVR solves the other half by making it easier to create content to work on almost any device that has a browser. Now Google is bringing those two together by making WebVR on Chrome work on Google Cardboard.