I view mimetic fiction, speculative fiction, religious tracts, Popsicle renderings of Madonna, etc. as being expressions of material culture. All of these divisions, arbitrary as they often are, are just as much of a list making as were the 72 parts of the divine language from the medieval period (itself an arbitrary thing ultimately).

As for the others that made this list, it originally started as being a fuzzy cloud of sorts, linking together thematic representations as much as anything else.