 Polythetic definitions are increasingly popular today as people seek to avoid the claim that an evolving social category has an ahistorical  essence.[14]  However, the difference between these two approaches is not that monothetic definitions fasten on a single property whereas polythetic definitions recognize more. Monothetic definitions can be multifactorial, as we have seen, and they can recognize just as many properties that are “common” or even “typical” of religions, without being essential. The difference is also not that the monothetic identification of the essence of religion reflects an ethnocentrism that polythetic approaches avoid. The polythetic identification of a prototypical religion is equally ethnocentric. The difference between them, rather, is that a monothetic definition sorts instances with a Yes/No mechanism and is therefore digital, and a polythetic definition produces gradations and is therefore analog. It follows that a monothetic definition treats a set of instances that all possess the one defining property as equally religion, whereas a polythetic definition produces a gray area for instances that are more prototypical or less so. This makes a monothetic definition superior for cases (for example, legal cases) in which one seeks a Yes/No answer. Even if an open polythetic approach accurately describes how a concept operates, therefore, one might, for purposes of focus or clarity, prefer to work with a closed polythetic account that limits the properties set, or even with a monothetic approach that limits the properties set to one. That is, one might judge that it is valuable to treat the concept religion as structurally fuzzy or temporally fluid, but nevertheless place boundaries on the forms of life one will compare.