Google Glass is a camera on your face. The self driving car revolutionizes transportation internationally forever. One makes you look like a hipster. The other

Google Glass is a camera on your face. The self driving car revolutionizes transportation internationally forever. One makes you look like a hipster. The other is primed to save tens of thousands of lives a year if it gets rapidly adopted. One weighs grams. The other can run you over and crush your skull. Perception matters. This initial design is so insanely non-threatening it achieves its appearance goals. It does not need to sell units, it needs to sell the idea.