It's difficult to get a feel for what a personalized car will look like in real life. You can't get a realistic perspective by customizing a car on the web, but visiting the dealership frequently means having to guess what your color choices look like. BMW doesn't think you should have to choose. It's testing a BMW i Visualizer app that uses Google's depth-sensing Tango technology to help you preview your ultimate i3 or i8. If you visit dealerships in several countries (including the US and UK) during the weeks ahead, you'll get to configure and walk around a virtual car in augmented reality. You can't sit in it, unsurprisingly, but you can poke your head inside to see if the layout is as posh as you thought it would be.