 The basic idea behind Marshall’s account is that the ascription of a property to a thing is intrinsically about that thing iff the ascription can be expressed in fundamental terms while only referring to, and quantifying over, the parts of \(x\). More formally, the account first analyses intrinsicality in terms of intrinsic aboutness by (3), and then provides an account of intrinsic aboutness in terms of perfect naturalness by (18). (In (18), perfectly natural operators and quantifiers are fundamental operators and quantifiers.)