 In another, weaker version (Casati &amp; Dokic 1994) it is the representational power of auditory content that is appealed to. Auditory experience has the power to represent sounds, and it has the power to represent movement (as when one hears the sound of a moving train’s whistle). It is then natural to assume that auditory experience would be able to represent sounds as moving, if sounds were indeed moving entities by their nature. But such is not the case; hence auditory experience correctly represents them as firmly located. This construal of the requirement is compatible with the existence of systematic, though possibly selective, illusion.