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Luis wanted a sofa for the empty corner by the window . He also wanted to see it there before he paid . The shop was on the other side of the city , and he did not want to carry a sofa home only to bring it back . On the shop site he found an app that used the phone camera . He stood in the living room and pointed the phone at the corner . A gray sofa appeared on the real floor . His lamp was still beside the window . The sofa sat between the lamp and the wall . He stepped to the left . The picture moved with him , and the sofa stayed in the corner . The room was real . The sofa was a digital object placed over the camera view . People call that augmented reality . Luis already knew a version of the idea . Pokemon Go had shown creatures on ordinary streets through a phone . A sofa was less exciting than a creature , and more useful that afternoon . The first sofa was too long . It crossed the gap he needed for the door . In the app he tried a shorter one . It sat under the window and left a clear path . The color was close to the rug . He still could not feel the fabric , and the app could not tell him if the cushions were hard . It could answer the only question that mattered : would this shape fit that corner ? His sister Elena came in with a headset . She wanted a short walk in a forest without leaving the apartment . She put the headset on . It covered her eyes , and the sound of wind replaced the sound of the street . The living room disappeared . When she turned her head , the path turned with her , because the headset followed the movement . That is virtual reality : a digital place in front of your eyes , with the real room blocked out . She lifted her hands . This headset tracked them , so the hands on the path moved when hers did . She reached toward a low branch . Then her stomach felt uneasy , and she took the headset off . Some people feel motion sickness in virtual reality . Elena said a short look was enough , and she set the headset on the table . Luis looked at his phone again . The shorter sofa was still in the real corner , next to the real lamp . The phone had kept his room and added the object he was choosing . The headset had replaced the room for a few minutes . He ordered the shorter sofa . He already knew which shape belonged in that corner .
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