Google and Lenovo just announced they’re partnering up to build an Android-powered, sub-$500 smartphone powered by Google’s extremely nifty Project Tango technology. Project Tango, first announced in 2014, is a project originated from Google ATAP, one of the search giant’s coolest and most secretive research labs. The basic idea behind Project Tango is to give smartphones and tablets a set of “eyes” that can understand depth perception, just like humans can. To date, Project Tango…