 One response to this objection would be to revise (Brewer 2005) the re-identification constraint on the possession of demonstrative concepts, or perhaps retract it altogether (Chuard 2006 explores various versions of the re-identification condition and argues that none are necessary for the possession of demonstrative concepts). Kelly (2001a), and Dokic and Pacherie (2001), however, argue that the re-identification condition is essential to concept possession.