BTS, BoA, NCT, Seventeen and Twice are just a few among many K-pop stars who performed this year and pushed the show’s immersive production to its fullest. BTS in particular made use of AR and spectacular 3D effects throughout the group’s set, even bringing in SUGA, a band member who’s currently recovering from surgery on a shoulder injury, to perform with them as a hologram in “Life Goes On.” The effect was made possible by a volumetric display, which records an object or place in 360-degrees and builds an interactive 3D avatar that can be viewed from any direction without special glasses or headsets. And BTS weren’t the only ones pushing the limits of tech: Treasure combined a robot arm with a laser system, presented a new kind of performance, and Twice performed on a virtual XR studio s...