Google recently announced a new initiative they are working on called Project Tango. They developed a prototype smartphone that can 3d map your environment by just pointing and moving around. It works by having a motion tracking camera and depth sensor in the back of the smartphone. While moving around it will create a 3d map of your surroundings. I think this is a great idea because it is a great step forward in helping blind people move around their homes. In the video you see a blind man walking around with a smartphone and his dog. The precise 3d map will tell them what is in front of them so they will not walk into objects. If anyone has seen the the Google selfless driving car video then you know that the old man in the video was blind as they revealed it in the end. I believe Google is trying to start a movement with technology helping the blind. Also, some of you might think this sounds familiar because it was in The Dark Knight. Well you are right and wrong. Batman used his version to track down the joker by mapping out Gotham City but his technology used sonar waves to create 3d maps, not tracking motion cameras.