 On the most common versions of externalism, though intentional contents are externally determined, mental representations themselves, and the states they partly constitute, remain “in the head.” More radical versions are possible. One might maintain that since thoughts are individuated by their contents, and some thought contents are partially constituted by objects external to the mind, then some thoughts are partly constituted by objects external to the mind. On such a view, a singular thought – i.e., a thought about a particular object – literally contains the object it is about. It is “object-involving.” Such a thought (and the mind that thinks it) thus extend beyond the boundaries of the skull. (This appears to be the view articulated in McDowell 1986, on which there is “interpenetration” between the mind and the world.)