We explore computer-generated virtual worlds and their use in everything from film-making to architecture. What will it take to build a real Metaverse, a persistent virtual world that anyone can plug into? This vision, though born in the minds of science fiction writers, is shaping the real-world ambitions of much of the tech world. Host Alok Jha talks to author Neal Stephenson, VR pioneer Jaron Lanier and the VFX team behind The Mandalorian. 

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