““Kant discovered A5 Active Knower. In a 1927 letter to Husserl, Heidegger is quite explicit about how important this issue is to his book: “What is the mode of being of the entity in which ‘world’ [in Husserl’s sense] is constituted? That is Being and Time’s central problem—namely, a fundamental ontology of Dasein. . . . As the mode of being that it is, it harbors right within itself the possibility of transcendental constitution””