"Building, Dwelling Thinking" influenced architectural theorists including Christian Norberg-Schulz, Dalibor Vesely, Joseph Rykwert, Daniel Libeskind and the philosopher-architect Nader El-Bizri.) Other interpreters believe "the Kehre" can be overstated or even that it doesn't exist. Thomas Sheehan (2001) believes this supposed change is "far less dramatic than usually suggested," and entailed a change in focus and method. Sheehan contends that throughout his career, Heidegger never focused on "being", but rather tried to define "[that which] brings about being as a givenness of entities." Mark Wrathall argued (2011) that the Kehre isn't found in Heidegger's writings but is simply a misconception. As evidence for this view, Wrathall sees a consistency of purpose in Heidegger's life-long pursuit and refinement of his notion of "unconcealment". Some notable "later" works are The Origin of the Work of Art", (1935), Contributions to Philosophy (1937), Letter on Humanism (1946). "Building Dwelling Thinking", (1951), "The Question Concerning Technology", (1954) " and What Is Called Thinking? (1954). Also during this period, Heidegger wrote extensively on Nietzsche and the poet Holderlin. Heidegger and the ground of history In his later philosophy, Heidegger attempted to reconstruct the "history of being" in order to show how the different epochs in the history of philosophy were dominated by different conceptions of being. His goal is to retrieve the original experience of being present in the early Greek thought that was covered up by later philosophers. Michael Allen Gillespie says (1984) that Heidegger's theoretical acceptance of "destiny" has much in common with the millenarianism of Marxism. But Marxists believe Heidegger's "theoretical acceptance is antagonistic to practical political activity and implies fascism. Gillespie, however, says "the real danger" from Heidegger isn't quietism but fanaticism. "History, as Heidegger understands it, doesn't move forward gradually and regularly but spasmodically and unpredictably." Modernity has cast mankind toward a new goal "on the brink of profound nihilism" that is "so alien it requires the construction of a new tradition to make it comprehensible." Allen extrapolated from Heidegger's writings that mankind may degenerate into scientists, workers and brutes. According to Allen, Heidegger envisaged this abyss to be the greatest event in the West's history because it would enable Humanity to comprehend Being more profoundly and primordially than the Pre-Socratics. Influences Augustine of Hippo Heidegger was substantially influenced by Augustine of Hippo, and Being and Time would not have been possible without the influence of Augustine's thought. Augustine's Confessions was particularly