What Apple did for smartphones, Google will soon be doing for headsets. What you're about to see was born, in part, in the development of Google Glass. It's wearable, but it exists in the virtual realm. Google has begun development of a headset that will be able to map the world around you as you walk through the world. With this headset, you'll enter a second reality, cultivated in Google Cardboard, developed in Project Tango.