Stanley Kubricks take on The Shining has made way for different interpretations, including one that gives a trippy twist to the Torrance family, the hotel, and the book Jack (Jack Nicholson) was working on. In 1980, Kubrick brought Stephen Kings 1977 novel The Shining to life, though with many changes that didnt please King. Still, The Shining is now considered one of the best horror movies of all time, and its many ambiguities, inconsistencies, mysteries, and more have made way for countless theories about whats truly going on with the characters.

https://screenrant.com/the-shining-theory-jack-book-real-fake-twist-explained/