having moved his summer home from Italy to Austria, he wrote "Good-bye to the Mezzogiorno"; other poems from this period include "Dichtung und Wahrheit: An Unwritten Poem", a prose poem about the relation between love and personal and poetic language, and the contrasting "Dame Kind", about the anonymous impersonal reproductive instinct. These and other poems, including his 1955–66 poems about history, appeared in Homage to Clio (1960). His prose book The Dyer's Hand (1962) gathered many of the lectures he gave in Oxford as Professor of Poetry in 1956–61, together with revised versions of essays and notes written since the mid-1940s. Among the new styles and forms in Auden's later work were the haiku and tanka that he began writing after translating the haiku and other verse in Dag Hammarskjöld's Markings. A sequence of fifteen poems about his house in Austria, "Thanksgiving for a Habitat" (written in various styles that included an imitation of William Carlos Williams) appeared in About the House (1965), together with other poems that included his reflection on his lecture tours, "On the Circuit". In the late 1960s he wrote some of his most vigorous poems, including "River Profile" and two poems that looked back over his life, "Prologue at Sixty" and "Forty Years On". All these appeared in City Without Walls (1969). His lifelong passion for Icelandic legend culminated in his verse translation of The Elder Edda (1969). Among his later themes was the "religionless Christianity" he learned partly from Dietrich Bonhoeffer, the dedicatee of his poem "Friday's Child." A Certain World: A Commonplace Book (1970) was a kind of self-portrait made up of favourite quotations with commentary, arranged in alphabetical order by subject. His last prose book was a selection of essays and reviews, Forewords and Afterwords (1973). His last books of verse, Epistle to a Godson (1972) and the unfinished Thank You, Fog (published posthumously, 1974) include reflective poems about language ("Natural Linguistics", "Aubade"), philosophy and science ("No, Plato, No", "Unpredictable but Providential"), and his own aging ("A New Year Greeting", "Talking to Myself", "A Lullaby" ["The din of work is subdued"]). His last completed poem was "Archaeology", about ritual and timelessness, two recurring themes in his later years. Reputation and influence Auden's stature in modern literature has been contested. Probably the most common critical view from the 1930s onward ranked him as the last and least of the three major twentieth-century British