Robinson's Regress Argument from Vagueness to Dualism

Howard Robinson's *From the Knowledge Argument to Mental Substance* contains two quite different arguments from vagueness of composite objects conclusion that I am not a physical object at all. One them, developed over course several chapters, takes following form: All (and only are candidates be human being) non-fundamental; non-fundamental things inevitably vague in various ways; this shows we must "make conceptual interpretation them", treating them as "artefacts conceptualisation"; and turn precludes our identifying ourselves with any such things. Some interesting morals fall out close consideration argument; but, end, materialists can reasonably resist it.