 He also began translation work of English language novels, starting with the works of Agatha Christie.His first poetry anthology, "Yosen no hi no yoru" ("Four Thousand Days and Nights", 1956), introduced a hard tone to modern Japanese poetry, using paradoxes, metaphors, and sharp imagery to describe the sense of dislocation and crisis experienced by people who had suffered through the rapid modernization of Japan and the destruction of World War II.With the publication of "Kotoba no nai sekai" ("World Without Words", 1962), he was established as a major poet.