[kazinator]

CLOS is completely, thoroughly, dyed-in-the-wool object oriented. It gives you generic functions which dispatch methods, by considering the class type of every (specializable) parameter. CLOS also avoids the silly problems by not putting methods into a class scope and dealing with symbol-table conflicts upon inheritance: like when inheriting from "graphical" and "lottery", working out whether the "draw" method renders pixels, or performs a lottery pick.

The CLOS design absolutely nails OO, and that's even before we look at the meta-object protocol.