Virtual reality (VR), the use of digital technology to replace reality with a wholly immersive simulation, was once the stuff of science fiction. So was its sibling, augmented reality (AR), which lets users interact with computer-generated content overlaid on the real world. Although researchers and developers had long speculated about real-life uses for digitally enhanced experiences, initial attempts have floundered because the technology couldn’t deliver a believably immersive experience.

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