 David Lewis (1986a, 1988) built on this point of Geach’s to mount an attack on endurantism, the theory that objects persist by being wholly located at different times, and that there can be strict identity between an object existing at one time and one existing at another time. Lewis argues that this is inconsistent with the idea that objects undergo real change. If the very same object can be both \(F\) (at one time) and not \(F\) (at another), this means that \(F\)-ness must be a relation to a time, but this means that it is not an intrinsic property. So any property that an object can change must be extrinsic, so nothing undergoes real change. Lewis says that this argument supports the rival theory of perdurantism, which says that objects persist by having different temporal parts at different times. While this argument is controversial (see Haslanger (1989), Johnston (1987) and Lowe (1988) for some responses), it does show how considerations about intrinsicality can resonate within quite different areas of metaphysics.