 This third type of argument for universalism has also been used to argue directly for the existence of temporal parts. Roughly speaking, instead of asking which temporal parts have a sum, we ask which matter-filled regions exactly contain objects. Unless we agree that they all do, we will get into trouble with borderline cases, as in the previous paragraph. But if every matter-filled region exactly contains an object, then even three-dimensional matter-filled regions exactly contain objects. So the world is full of instantaneous objects: these look very like temporal parts. This argument is now often known as the ‘argument from vagueness’. Objections here include those mentioned in the previous paragraph; we might also question whether the instantaneous objects are really temporal parts.