Christopher Nolan’s movies often leave more questions than answers, making way for a variety of theories on what truly happened to the characters, their real intentions, and even the meaning of the whole movie, and here are some theories that change Nolan’s movies. Nolan's works have stood out thanks to his narrative and visual styles (and his insistence on using as less CGI as possible), as well as for the themes he frequently uses in his movies, such as memory, identity, and time. Nolan made his feature directorial debut in 1998 with the crime thriller Following, and his big break arrived two years later with the psychological thriller Memento.
https://screenrant.com/christopher-nolan-movies-fan-theories/