Before we start, I would like to share two stories. When Google acquired Android way back in 2005, Google had the foresight that the next era of computing which started with mainframe, then minicomputers, then personal desktop and later desktop would be miniaturized to the smartphone. Google had a product ready only to be stopped by the first iPhone launch in 2007, which proved to be so ground breaking that Google had to go back to the drawing board and redesign Android to be more like iOS.
Google first announced the smart glasses in 2013. The project started in mid-2011 by Google X, an out of box think tank by Google to explore far out ideas without worrying too much about R&D cost. The computer would project images on your eyes, and transfer sound through your bone. It was a really breaking technology. That being said, it was a spectacular failure and Google kill the project in early 2015, around 2 years after launch.