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 in itself 'Being in itself' to be at the same time the most vague and general concept possible to contemplate, but also the topic of greatest interest to him as a philosopher. In Sartrean existentialism, being-in-itself ("être-en-soi") is also contrasted with the being of persons, which he describes as a combination of, or vacillation or tension between, being-for-itself ("être-pour-soi") and being-for-others ("I'être-pour-autrui"). Being-in-itself refers to objects in the external world — a mode of existence that simply is. It is not conscious so it is neither active nor passive and harbors no potentiality for transcendence. This mode of being is relevant to