||Philosophers (and ordinary folk) draw a distinction between the features that a things has in and of itself and those that it has at least partly in virtue of the way the world is. An egg may have a certain mass and be the first egg that a young hen lays in her life. It has the first property just in virtue of how it is, while the second depends on its relation to other eggs (and the hen). The distinction has played a role in such issues as the nature of moral value, of real change, and of ontological dependence (in particular, supervenience). No single analysis has garnered widespread support; the search for one continues alongside related debates about the notions introduced in various analyses, such as that of a pure natural property and of the grounding relation between properties.