come apart. Proposed candidates for bearers of final non-intrinsic value include unique or rare items (e.g. a stamp) or historically significant items (e.g. the pen that Abraham Lincoln used to sign the Emancipation Proclamation). Being-rare and having-been-used-by-someone are extrinsic properties that may be responsible for their bearers having final value, i.e. being valuable for their own sake. Some philosophers have questioned whether extrinsic values should be regarded as values at all rather than as mere indications of values. One reason for considering this idea is that adding or removing extrinsically valuable things does not affect the value of the whole if all intrinsically valuable things are kept constant. For example, the 2011 Tōhoku earthquake had a negative extrinsic value because of all the damage it caused. But arguably, the world would not have been a better place if exactly the same damage had been caused without the earthquake. Ontological status of values In axiology, it is often important to distinguish between the entity that is valuable and the features in virtue of which it is valuable. For example, an experience may be said to be valuable in virtue of being pleasurable. This distinction is particularly relevant for intrinsic values since it is commonly held that the intrinsic value of an entity supervenes on its intrinsic features. This means that the entity could not have a different intrinsic value unless it had different intrinsic features. Substantive theories of value focus on the features in virtue of which something has intrinsic value. Popular candidates for these features include pleasure, virtue and knowledge. Another question concerns the nature of the entities that are the bearers of value. The main approaches to this question can be divided into the Kantian tradition, which considers concrete things like persons to be the bearers of value, and the Moorean tradition, which holds that only states of affairs bear value. This difference is important when determining whether a value is extrinsic or intrinsic to an entity. Some philosophers hold that objects like Napoleon's hat are valuable because of their relation to extraordinary persons. From a Kantian perspective, this value must be extrinsic since it is based on the extrinsic property of having been worn by an extraordinary person. But from a Moorean perspective, it can be intrinsic since it is born not by the hat but by a state of affairs involving both the hat and Napoleon. The