Not only the demonstration of the most elemental structures of being in the world, the definition of the concept of world, the clarification of the nearest and most average who of this being, of the they self, the interpretation of the there, but above all the analyses of care, death, conscience, and guilt show how the commonsense way of taking care of things has taken over the potentiality of being of Dasein and the disclosure of that potentiality, or rather its closing off.