 Most of the philosophical applications of intrinsicality are independent of its precise analysis. Work on its analysis, however, has helped clarify these applications by allowing us to distinguish between different notions of intrinscality and different notions in the vicinity of intrinsicality, and by giving us a greater understanding of these various notions and of what properties satisfy them. A good example of the latter kind of advance is Theodore Sider’s (2003) observation that most of the properties in folk theory are ‘maximal’ and hence not intrinsic properties. This observation provides a strong argument against various theories that appeal to the intuitive intrinsicality of some everyday property.