  What the existential analytic has given us so far is a phenomenological description of Dasein's within-the-world encounters with entities. The next clarification concerns the notion of world and the associated within-ness of Dasein. Famously, Heidegger writes of Dasein as Being-in-the-world. In effect, then, the notion of Being-in-the-world provides us with a reinterpretation of the activity of existing (Dreyfus 1990, 40), where existence is given the narrow reading (ek-sistence) identified earlier. Understood as a unitary phenomenon (as opposed to a contingent, additive, tripartite combination of Being, in-ness, and the world), Being-in-the-world is an essential characteristic of Dasein. As Heidegger explains: 