Sell also: hierarchy
Our ultimate goal is extensible programming (EP). By this, we mean the construction of hierarchies of modules, each module adding new functionality to the system.
A deck of cards is built like the purest of hierarchies, with every card a master to those below it, a lackey to those above it.
Defining OO as based on the use of class hierarchies and virtual functions is also practical in that it provides some guidance as to where OO is likely to be successful.
Inside a religious body you get sects and hierarchies, inside an information network you get bazaars and cathedrals, it is the same, call them what you like. They survive by pointing the finger of blame at each other.
Ideals jump across the hierarchies of the printed word.