Google glass is awesome. The most amazing and coolest thing that ever happend in whole Universe. The first glass that was invented after glass.
Imagine that you are ram and some things are falling down from the sky like fruits, vegetebles, iPads. And you need to smash them by your head. You should have propper speed to do it. But you can't smash everything. Sometimes it happend that anvil is falling or stone anyway something very solid that can kill you, so you should avoid it. You also have special abilities that you can get smashing thing like flying hornes that can smash things at the distance.
Sooner we can add multiplayer so you can play with your friends that can be same rams even with argumented reality.