 The priority monist could in principle try to contest 21, but the notion of an intrinsic property looks to have important theoretical work to  do.[57]  For instance, intrinsicness seems connected to other core notions like duplication (duplicates agree in all of their intrinsic properties) and change (change is change in intrinsic properties). If one wants to say that some subcosmic objects are duplicates and some not, or say that some subcosmic objects undergo change and some do not, then it seems that one needs to posit a real difference between the intrinsic and extrinsic properties of subcosmic objects. It seems to me that the priority monist should hope to capture this plausible distinction rather than erase it.