 According to most proponents of tropes, tropes are ontologically simple.[10] Here this should be taken to mean that tropes have no constituents, in the sense that they are not ‘made up’ or ‘built’ from entities belonging to some other category. Simple tropes, thus understood, can still have parts—even necessarily so—as long as those parts are also tropes (cf. e.g., Robb 2005:  469).[11],  [12]