Being and Time important, i.e., "Dasein". Heidegger wrote that "Being and Time" was made possible by his study of Edmund Husserl's "Logical Investigations" (1900–1901), and it is dedicated to Husserl "in friendship and admiration". Although Heidegger did not complete the project outlined in the introduction, "Being and Time" remains his most important work. It was immediately recognized as an original and groundbreaking philosophical work, and later became a focus of debates and controversy, and a profound influence on 20th-century philosophy, particularly existentialism, hermeneutics, deconstruction, and the enactivist approach to cognition. "Being and Time" has been described as the most influential version of existential
Being and Time of what a hammer "is" is not determined by a theoretical understanding of its presence, but by the fact that it is something we need at the moment we wish to do hammering. Only a "later" understanding might come to contemplate a hammer "as" an object. The total understanding of being results from an explication of the implicit knowledge of being that inheres in "Dasein". Philosophy thus becomes a form of interpretation, but since there is no external reference point outside being from which to begin this interpretation, the question becomes to know in which way to proceed with this