In Moby-Dick, existentialist themes emerge through Captain Ahab’s obsessive quest for the white whale, which symbolizes an absurd and indifferent universe. Ahab’s defiance of fate and his struggle to impose meaning on an inherently meaningless world reflect existentialist ideas of individual agency and the confrontation with existential despair. His tragic end underscores the futility of seeking absolute meaning in a chaotic, indifferent cosmos.