You probably haven't heard of Perception, but they're described as a cutting edge design lab that pioneers the "visionary process of Science Fiction Thinking to architect the future." Dividing their time between science fiction and science fact, they work with filmmakers on movies like 2019's Avengers: Endgame.
They contributed towards the movie's time-travel explanation, and on their website, Perception has shared a dozen different theories for how it could work in the Marvel Cinematic Universe.
You can see the full gallery at their website, but among the variations discussed below are Time being a physical being (with some major nods to the comic books) and the souls of the heroes travelling from their bodies into their past selves, meaning they don't physically travel through time.
"The team at Perception was focused on the mechanics of how it might work, what it might look like, and how you would explain it," they reveal. "Perception also assisted the filmmakers with exploring ideas surrounding scientific considerations, technology-based concepts, and potential narrative influences."
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