94 I. 3
Being and Time

Only in some definite mode of its own Being-in-the-world can Dasein discover entities as Nature.1 This manner of knowing them has the character of depriving the world of its worldhood in a definite way. 'Nature', as the categorial aggregate of those structures of Being which a definite entity encountered within-the-world may possess, can never make worldhood intelligible. But even the phenomenon of 'Nature', as it is conceived, for instance, in romanticism, can be grasped ontologically only in terms of the concept of the world—that is to say, in terms of the analytic of Dasein.

When it comes to the problem of analysing the world's worldhood ontologically, traditional ontology operates in a blind alley, if, indeed, it sees this problem at all. On the other hand, if we are to Interpret the worldhood of Dasein and the possible ways in which Dasein is made worldly [Verweltlichung], we must show why the kind of Being with which Dasein knows the world is such that it passes over the phenomenon of worldhood [66] both ontically and ontologically. But at the same time the very Fact of this passing-over suggests that we must take special precautions to get the right phenomenal point of departure [Ausgang] for access [Zugang] to the phenomenon of worldhood, so that it will not get passed over.

Our method has already been assigned [Anweisung]. The theme of our analytic is to be Being-in-the-world, and accordingly the very world itself; and these are to be considered within the horizon of average everydayness—the kind of Being which is closest to Dasein. We must make a study of everyday Being-in-the-world; with the phenomenal support which this gives us, something like the world must come into view.

That world of everyday Dasein which is closest to it, is the environment. From this existential character of average Being-in-the-world, our investigation will take its course [Gang] towards the idea of worldhood in general. We shall seek the worldhood of the environment (environmentality) by going through an ontological Interpretation of those entities within-the-environment which we encounter as closest to us. The expression "environment" [Umwelt] contains in the 'environ' ["um"] a suggestion of spatiality. Yet the 'around' ["Umheruin"] which is constitutive for the environment does not have a primarily 'spatial' meaning. Instead, the spatial character which incontestably belongs to any environment, can be clarified only in terms of the structure of worldhood. From this point of view, Dasein's spatiality, of which we have given an indication in Section 12, becomes phenomenally visible. In ontology, however, an attempt has been made to start with spatiality and then to Interpret the Being of the 'world' as res extensa.

1 'Das Seiende als Natur kann das Dasein nur in einem bestimmten Modus seines In-der-Welt-seins entdecken.'

Being and Time (M&R) by Martin Heidegger