 The Problem of Perception is that if illusions and hallucinations are possible, then perceptual experience, as we ordinarily understand it, is impossible. The Problem is animated by two central arguments: the argument from illusion (§2.1) and the argument from hallucination (§2.2). (A similar problem arises with reference to other perceptual phenomena such as perspectival variation or conflicting appearances: see Burnyeat (1979) and the entry on sense-data). For some classic readings on these arguments, see Moore (1905, 1910); Russell (1912); Price (1932); Broad (1965); and Ayer (1940), see Swartz (1965) for a good collection of readings. And for more recent expositions see Snowdon (1992), Valberg (1992), Robinson (1994: Chapter 2), Smith (2002: Chapters 1 and 7), Martin (2006), Fish (2009: Chapter 2), Brewer (2011: Chapter 1) and Pautz (2021).