 if different experiences are to belong to a single consciousness, there must be the possibility of self­-consciousness on the part of the subject of those experiences. (P.F. Strawson 1966: 93; for discussion of Kant’s views of the matter, see Henrich 1989; Powell 1990; Brook 1994; Keller 1998; Kitcher 2011; Allison 2015; for detailed discussion of whether consciousness is necessarily unified, see Bayne 2010; see also entry on  unity of consciousness).  