“Thrownness” is first used in Being and Time to name Dasein’s passive coming into being open, and so Dasein’s birth, origin, or ground. Heidegger continues to describe Dasein as thrown in his later thought, closely associating thrownness with adaptation (Ereignis) and identifying the “thrower” of the throw into existence as being. Especially in Being and Time, the pure throw into Dasein continues as a throw into concretion (facticity), falling, and inauthenticity, although it is not entirely clear how these phenomena are both connected to and distinguished from one another.