The Greek play of ''Oedipus Rex'' by [[Sophocles]] features the sphinx as a creature who tests the titular character with a riddle. The riddle of the sphinx has since become a common trope in various forms. | The Greek play of ''Oedipus Rex'' by [[Sophocles]] features the sphinx as a creature who tests the titular character with a riddle. The riddle of the sphinx has since become a common trope in various forms. |