Tango uses software and sensors to track motions and size up the contours of rooms, empowering Lenovo's new phone to map building interiors. If Tango fulfills its promise, furniture shoppers will be able to download digital models of couches, chairs and coffee tables to see how they would look in their actual living rooms. [...] Tango's room-mapping technology is probably still too abstract to gain mass appeal right away, says Ramon Llamas, an analyst at the IDC research group. Google already has released experimental Tango devices designed for computer programmers, spurring them to build about 100 apps that will work with Lenovo's new phone. At a conference for developers last month, Google demonstrated an app for picturing furniture in actual living rooms and for taking selfies with digital dinosaurs. While AR tries to blend the artificial with your actual surroundings, virtual reality immerses its users in a setting that's entirely fabricated. Lee believes three-dimensional imagery and data — whether through the new Tango phone or another technology — will help reshape the way people interact with e-commerce, education and gaming.