Culture and the formation of a cultural identity is also a major theme in several of Akutagawa's works. In these stories, he explores the formation of cultural identity during periods in history where Japan was most open to outside influences. An example of this is his story "Hōkyōnin no Shi" ("The Martyr", 1918) which is set in the early missionary period. The portrayal of women in Akutagawa's stories was shaped by the influence of three women who acted as a mother for Akutagawa. Most significantly his biological mother Fuku, from whom he worried about inheriting her mental illness. Though he did not spend much time with Fuku he identified strongly with her, believing that if at any moment he might go mad life was meaningless. His aunt Fuki played the most significant role in his upbringing. Fuki controlled much of Akutagawa's life, demanding much of his attention especially as she grew older. Women that appear in Akutagawa's stories, much like the women he identified as mothers, were mostly written as dominating, aggressive, deceitful, and selfish. Conversely, men were often represented as the victims of such women, such as in "Kesa to Morito" ("Kesa and Morito", 1918), in which the leading female character attempts to control the actions of both her lover and husband. The final phase of Akutagawa's literary career was marked by his deteriorating physical and mental health. Much of his work during this period is distinctly autobiographical, some even taken directly from his diaries. His works during this period include "Daidōji Shinsuke no hansei" ("The Early Life of Daidōji Shinsuke", 1925) and "Tenkibo" ("Death Register", 1926). Akutagawa had a highly publicized dispute with Jun'ichirō Tanizaki over the importance of structure versus lyricism in story. Akutagawa argued that structure, how the story was told, was more important than the content or plot of the story, whereas Tanizaki argued the opposite. Akutagawa's final works include "Kappa" (1927), a satire based on a creature from Japanese folklore, "Haguruma" ("Spinning Gears", 1927), "Aru ahō no isshō" ("A Fool's Life"), and "Bungeiteki na, amari ni bungeiteki na" ("Literary, All Too Literary", 1927).