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ERRATUM: sorry, my sick brain misexplained the examples concerning Diana Deutsch's octave illusion: obviously, the notes are all in the same scale (and not in a different scale) but located on different PITCHES of the scale. Sorry for this shortcut that makes my speech false... I dissect Shepard's scale, Risset's glissando, Diana Deutsch's octave illusion that turn our brains upside down Background music: What now (Frank Cotty) https://open.spotify.com/intl-fr/albu... TIKTOK: https://www.tiktok.com/@frankcotty?la... INSTAGRAM: / frankcotty FACEBOOK: / frank-cotty-1575673299159145 TWITTER: / frankcotty SOUNDCLOUD (compos): / frankcotty SOUNDCLOUD (covers): / frenchcovers GOODIES: https://shop.spreadshirt.fr/frankcotty DEEZER: https://www.deezer.com/fr/artist/487809 SPOTIFY: https://open.spotify.com/artist/7H8be... APPLE MUSIC: https://music.apple.com/fr/artist/fra... DISCORD: / discord PRO CONTACT: [email protected] If you read this, put a chicken emoji in the comments