In the course of demarcating the senses, Aristotle defined sound in De Anima as the proper object of hearing: ‘sight has color, hearing sound, and taste flavor’ (II.6, 418b13). Sound cannot be seen, tasted, smelled, or felt. And nothing other than sound can be directly heard. (Objects are heard indirectly by virtue of the sounds they produce.) All subsequent commentators agree, often characteri...