No More Learning

In the case of Der- rida, this involved the conclusion of the linguistic or semiological turn according to which the twen- tieth century had belonged to the philosophies of language and writing; in the case of Luhmann, on the other hand, it was the completion of the aban- donment of philosophy called for by Wittgenstein, achieved through a resolute withdrawal of thought from the tradition of philosophies of the spirit and language in order to           themselves in the field of metabiology, the general logic of differ- ences between system and environment.