With a new season of Hi-Phi Nation coming in early 2027, Barry is digging through the archives and sharing some of his favorite episodes, including this one from Season 3. Pyotr Tchaikovsky composed and conducted his final symphony in 1893. He died nine days later, after having knowingly drunk an unboiled glass of water during a cholera epidemic. Deep into Symphony No. 6, there is a paradoxical passage that, when played, no one will be able to hear. This is because Tchaikovsky scored it to contain a musical illusion. We uncover the mystery of why he put it there. Sound illusions reveal some of the most puzzling features of the human mind, most notably its insistence that it knows reality better than reality itself. In this episode from 2019, we listen to some of the most curious auditory illusions to find out how some of the features of sounds are generated by the human mind, rather than features of the external world. The illusions reveal something deep about some of the most treasured human endeavors, including music and language. Guest voices include Diana Deutsch, Casey O'Callaghan, and Christine Howlett. Thanks to Kenna Tuggle for violin passages. Join Slate Plus to unlock full, ad-free access to Hi-Phi Nation and the rest of your favorite Slate podcasts. Subscribe directly from the Hi-Phi Nation show page on Apple Podcasts or Spotify. Or, visit slate.com/hiphiplus to get access wherever you listen. Hosted on Acast. See acast.com/privacy for more information.