Google demonstrated an augmented reality product last week that may never exist. I don’t want you to look at it and decide to sit at your desk hitting refresh on the Google Store waiting for it to go on sale. It’s exciting but it's not that kind of demo. It’s hard for most people to understand the obsession with AR. The idea of glasses with extra digital stuff – it sounds distracting instead of enticing. So what Google really showed off was a visualization of augmented reality that makes it easy to see why the tech companies are working so hard on it. If you look at it from that perspective,...