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People often interpret *Ashby’s Law* (after W. Ross Ashby) as if the *system*'s internal states must have the ***same level of variety*** as its *environment* in order to survive, which implies that the system should be able to *respond* (react) to every little disturbance from the environment.

This is not completely true because, on the lowest, , level, the system blocks from an (environmental) reaching the (internal, system protected) in two ways:

1️⃣ isolation (sheltering) from most environmental disturbances, and

2️⃣ reaction to (parring with) the remaining disturbance that managed to *break through* this passive protection.

from "Intro to "
pespmc1.vub.ac.be/ASHBBOOK.htm

Ashby's principle of requisite states, in fact, that the variety of the system must be large at least as the variety of the system .

As an *external* can never have the full picture of the *internal* variety of states the controlled system can find itself in, it is obvious that, for control to be , the controller must be an integral part of the same self-organized (controlled) .

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