`  ::::Whether the title is “Deutsch Tritone Paradox” or just “Tritone Paradox” is actually a minor issue when compared to the erroneous implication that Shepard’s 1964 ``bi-stable illusion`` is  the same as the “Tritone Paradox.” Shepard wrote: '‘diametrically opposed tones are ambiguous and the second tone is judged to be higher about as often as it is judged to be lower'’. The whole point of the “Tritone Paradox” is that the opposite occurs – notes are judged to be higher or lower depending largely on note name. Let’s leave the simplified title, but also not credit someone historically for work which claims the opposite.    `