 This case displays a structure common to many canonical examples of self-locating belief, which we can use to point toward our subject. As a first pass: the example describes an agent who is in, or comes to be in, a particular doxastic state, where that doxastic state is difficult or impossible to characterize without using indexicals. (That is, without using expressions that vary in their denotations in different contexts of use, such as “I”, “now”, “here”, etc.) Hence the title of Perry’s paper, “The Problem of the Essential Indexical” (1979).