Every centre of energy has its point of view of the whole of the remainder of the world—that is to say, its perfectly definite valuation, its mode of action, its mode of resistance. The "world of appearance" is thus reduced to a specific kind of action on the world proceeding from a centre.
But there is no other kind of action: and the "world" is only a word for the collective play of these actions. Reality consists precisely in this particular action and reaction of every isolated factor against the whole.
There no longer remains a shadow of a right to speak here of "appearance." ...
The specific way of reacting is the only way of reacting; we do not know how many kinds and what sort of kinds there are.
But there is no "other," no "real," no essential being,—for thus a world without action and reaction would be expressed....
The antithesis: world of appearance and real world, is thus reduced to the antitheses "world" and "nonentity."
568.
A criticism of the concept "real and apparent world."—Of these two the first is a mere fiction, formed out of a host of imaginary things.
Appearance itself belongs to reality: it is a form of its being; i.e. in a world where there is no such thing as being, a certain calculable world of identical cases must first be created through appearance; a tempo in which observation and comparison is possible, etc.