 Both versions of this approach are based on theories of persistence and change that attempt to reconcile eternalism and the B-theory of time with endurantism, the view that objects are wholly present at multiple times and do not have temporal parts (for more on endurantism, see  section 6.3).  Accordingly, the standard criticisms of the relevant theories of persistence and change (on which see Haslanger 2003) would seem to apply equally to the relativizing approach to the problem of qualitative variation for extended simples. The main criticism is that, by appealing to relations to regions, the relativizing approach makes an object's color distribution (or whatever) a dyadic relation or an extrinsic property, when it is in fact (says the critic) an intrinsic property, involving only the object, its parts, and the intrinsic properties of these things.