 One might also argue for an emergentist form of substance dualism as necessary to account for (what many strong emergentists regarding consciousness accept) there being unified subjects of conscious experience (Nida-Rümelin 2007) or it being an objective matter whether a conscious subject does or does not survive certain kinds of radical change (Swinburne 2013). Finally, many general accounts of the categories of substance/object or physical substance/object in particular entail that if an object has non-physical properties, it will fail to count as a composed or physical substance (Francescotti 2001, Schneider 2012, and O’Connor 2018.)