 Even this characterization of a contrast is dubious if we note that by the last criterion “object with mass more than 2 kg” is not an individuative term since the sum of any two such objects is another such object, whereas “object with mass less than 2 kg” fails the test since the sum of two such objects sometimes has mass over 2 kg. It is difficult to see any important respect in which the two expressions divide their reference differently. Object more than 2 kg and object less than 2 kg seem to divide their reference.