 It seems plausible that there should be some intimate connection between this notion of naturalness for classes and naturalness for properties; but it is not obvious how it should be spelled out. Since there seem to be differences in naturalness among coextensive properties—for example, being charged seems more natural than being charged and not a talking donkey—identifying a property’s degree of naturalness with that of its extension (the class of its instances) is not a promising approach. More plausibly, one might identify the degree of naturalness of a class with the maximum degree of naturalness of the properties whose extension it is, or with some kind of aggregate of the degrees of naturalness of these properties. However, this may still be too simple, since there is a case that the naturalness of other properties need to be taken into account. For example, if there is a very natural equivalence relation (reflexive, symmetric, transitive relation) with only a few equivalence classes, we might want to count those equivalence classes as highly natural even if they are not the extensions of any highly natural monadic properties.