I pinched my thumb and index finger together in midair. A floating window opened; another gesture moved it aside. There was no monitor in sight, yet I was rearranging displays as if using a computer from a science-fiction film. Switching glasses, I watched waves roll across a 3D seascape. A concert clip gave the scene unexpected depth. The two demos served different purposes at a showcase by Chinese extended reality device maker Xreal in Seoul’s Hongdae district Friday. The Xreal’s next-generati