is the 1843 masterwork by Danish philosopher Søren Kierkegaard , famously published under the pseudonym Victor Eremita . It is a foundational text of existentialism that explores the radical choice between two conflicting "stages" of human existence: the aesthetic and the ethical. Core Structure and Pseudonyms
The book is presented as a "fragment" of papers found by the editor in a secret desk compartment. This literary device allows Kierkegaard to present competing worldviews without endorsing one as objectively "correct". Either/Or: A Fragment of Life