One theory has been that Rey actually stepped into the World Between Worlds, a place outside time and space seen in Star Wars Rebels. Rian Johnson made it clear he’s a fan of the concept and hopes that we see more of the World Between Worlds in Star Wars, but he was making no direct reference to that here. He saw this as an internal experience for Rey, it’s more about what she felt than where she was, and it’s not supposed to give any concrete answers.
CinemaBlend Latest Content – Star Wars: The Last Jedi Director Shares Great Explanation Behind Why Rey’s Dark Mirror Scene Was Left So Open For Interpretation
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February 22, 2021