Object-Orientation FAQ

1.5) What Is The Infinite Regress Of Objects And Classes?

In the authors opinion, a myth.  The story goes an object is an instance of a
class (Meta-Object), a class is an instance of a Meta-Class, which must also
be an instance of a Meta-Meta-Class, which must also be an instance of a Meta-
Meta-Meta-Class, ...  Closure can be achieved with an instance-of loop, as with
a Meta-Class being an instance of itself or with a "Meta-Class - Meta-Class
class" instance-of loop (as in Smalltalk).

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