Film director Steven Soderbergh says he faced a lot of challenges in making Mosaic, including what to call it. In January, HBO will air Mosaic as a six-episode series over five nights. But starting today, you can for iOS and tvOS, and take in its roughly 7.5 hours in interactive form, shifting your perspective among the story’s main characters in a branching narrative. Mosaic most resembles the sort of show you might binge-watch on Netflix — all of its episodes will be available at once — and yet it allows for a level of interaction only possible inside a custom app.

“It’s not a TV show, and it’s not a movie,” Soderbergh told me and two other reporters on Tuesday afternoon in San Francisco. “It’s something…

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