The cinematic treasures are around 120 years old, dating back to the U.K.'s Victorian era.
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They're the work of W.K.L. Dickson, a protégé of inventor Thomas Edison.
The BFI's National Archive carefully restored the delicate films to digital media. Curator Bryony Dixon said it was a painstaking process.
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"It's kinda crazy, isn't it, 120-year-old films in an IMAX? But as a one-off spectacle, very much in keeping with how Dickson would have done it himself, I think," Dixon said. "It's a joy."
An orchestra accompanied "The Great Victorian Moving Picture Show" at its London premiere.