Kazantzakis' first published work was the 1906 narrative, "Serpent and Lily" (Όφις και Κρίνο), which he signed with the pen name Karma Nirvami. In 1907 Kazantzakis went to Paris for his graduate studies and was deeply influenced by the philosophy of Henry Bergson, primarily the idea that a true understanding of the world comes from the combination of intuition, personal experience, and rational thought. The theme of rationalism mixed with irrationality later became central to many of Kazantzakis' later stories, characters, and personal philosophies. Later, in 1909, he wrote a one-act play titled "Comedy", which was filled with existential themes, predating the post-World War II existentialist movement in Europe spearheaded by writers like Jean-Paul Sartre and Camus. After completing his studies in Paris, he wrote the tragedy, "The Master Builder" (Ο Πρωτομάστορας), based on a popular Greek folkloric myth.