 For discussion of how the problem of perception, somewhat differently construed, arises in the senses other than vision, see Perkins (1983). There is much literature on non-visual perception, not all of it addressing the problem of perception, but much of it will be relevant to considering the problem of perception in non-visual modalities: on sounds, see Nudds (2001), O’Callaghan (2007), Nudds and O’Callaghan (2009); on smell, see Batty (2011), Richardson (2013a, 2013b); on touch, see O’Shaughnessy (1989), Martin (1992) and Fulkerson (2014); for the senses in general, see Nudds (2003), Macpherson (2011, 2011a) and Stokes, Matthen, and Briggs (2015)). On multisensory perception, see O’Callaghan (2019).