This paper deals with an implementation of the ObjVlisp
model in the Smalltalk-80 language.

We demonstrate that Smalltalk is extensible and flexible enough
to support simultaneoulsy its standard metaclass architecture plus
the ObjVlisp one.

We demonstrate also that the ObjVlisp model
was enough general to be transposed directly in the  Smalltalk world.

The result of this cross-fertilization is the ``ObjVlisp'' browser
which allow to build and experiment a new pedagogical discourse in the
field of class-oriented languages by making explicit the metaclass 
level.
We develop this discourse as an answer to the Borning/O'Shea
question about Smalltalk learnability.

To enhance this discourse we propose a first library of
metaclasses which can be composed together to build a
multi-levels instantiation hierarchy.
Because metaclasses are true classes they can be also composed by
using the multiple inheritance scheme provided by Ingalls and Borning
for simple classes.

Finaly we introduce new problems such as which ergonomy for a 
(meta)class browser, and inheritance compatibility 
between classes which do not share
the same metaclasses.