This is the ending to director Robert Eggers' 2019 film The Lighthouse explained. If you’re still mulling over what that was all about allow us to shed a light. We’d strongly advise you to go watch the film before proceeding with this spoiler-heavy analysis. The film centers on Robert Pattinson as Ephraim Winslow and Willem Dafoe as Thomas Wake two lighthouse keepers who must grapple with confined living space strong storms and growing tensions between each other. However... that's where the simple explanation ends. If you left the theater scratching your head after seeing The Lighthouse then allow us to explain!