A possibility is “a possible way of being,” a field of meaningfully interconnected states of objects or events that might be actualized or realized (but need not be so actualized). To be a Dasein is unavoidably to be and to understand oneself in terms of possibilities. Possibility is a limit concept rather than logical possibility: the ontological structure of Dasein is finitude, defined by death, the impossibility of possibility or the possibility of utter impossibility.