For the 25 years I have been writing about technology, the prospect of holograms has been floating around like, well, a hologram.
Indeed, even earlier, my 1972 sixth-form general studies project on future technology promised, on the best evidence, that by the 1980s, it would be possible to project a talking hologram of your late grandmother into her favourite chair.
Five years later, a holographic Princess Leia pleaded for help from Obi-Wan Kenobi in the first Star Wars film, yet beyond that, the technology has been a little behind schedule.
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