 What hangs on this? First, it bears on questions about audition’s content. If we cannot exhaustively characterize auditory experience in terms that are modality-specific or distinctive to audition, then we might hear as of things we can see or experience with other senses. This is related to one puzzling question about hearing sound sources: How could you hear as of something you could see? Rather than just a claim about audition’s content that requires further explanation, we now have a story about why things like sound sources figure in the content of auditory experience. Second, all of this may bear on how to delineate what counts as auditory perception, as opposed to visual or even amodal perception. If hearing is systematically impacted by visual processes, and if it shares content and phenomenology with other sense experiences, what are the boundaries of auditory perception? Multimodal perception may bear on the question of whether there are clear and significant distinctions among the sense modalities (cf. Nudds 2003). Finally, multimodal perceptual experiences, illusions, and explanatory strategies may illuminate the phenomenological unity of experiences in different modalities, or the sense in which, for instance, an auditory experience and a visual experience of some happening comprise a single encompassing experience (see the entry on  the unity of consciousness).  