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This article is from the Object-Oriented Technology FAQ, by Bob Hathaway rjh@geodesic.com with numerous contributions by others.

1.17) Is An Object A Class? (Object-Oriented Technology)

In a Level 3 System and above yes, but only instances of a Meta-Class are
Classes. Instances of a Class (ordinary objects) are not classes (excluding
hybrid systems). However, all objects may be classes in single hierarchy
systems, since any object may act as a class (provide object instantiation or
act as a shared parent).

 

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