 This suggests an important point which is rarely mentioned (but see Recanati 1994 for a related observation). Narrowness need not be construed as an all-or-nothing property. We can understand it instead as a matter of degree: one content of a mental state is narrower than another the further away from the actual world we need to go in logical space in order to find a world in which the subject’s intrinsic properties are the same but the state does not have that content. (Alternatively, we could relativize the notion of narrow content to a set of possibilities; the more possibilities the set includes, the fewer contents will count as narrow. For many purposes we never consider Twin-Earth possibilities; for such purposes the proposition that water is wet may count as a narrow content of a subject’s belief.) On this way of thinking of things, narrowness as it is usually defined is a limiting case: narrowness relative to the set of all metaphysically possible worlds. The concept of narrowness may be useful even if the limiting case never occurs, just as the concept of flatness is useful even though in this world the limiting case of absolute flatness never occurs.