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World - from the perspective of an observer the world is the unity of the difference between system and environment.
As a unit, it can never be observed. It is the blind spot of each observer - With the Modern, the term loses the reference to "things" and is based on the indeterminacy of meaning.
W. is a paradoxical concept, imagine the combination of definiteness and indefiniteness.
Einführung in die Systemtheorie Heidelberg 1992
Die Kunst der Gesellschaft Frankfurt 1997