One may try to do away with these contradictions by making a distinction between Husserl's and Heidegger's phenomenologies; yet the whole of Sein und Zeit springs from an indication given by Husserl and amounts to no more than an explicit account of the 'nat rlicher Weltbegriff or the 'Lebenswelt' which Husserl, towards the end of his life, identified as the central theme of phenomenology, with the result that the contradiction reappears in Husserl's own philosophy.