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Re:A Linguist Explains Why 'Laurel' Sounds Like 'Yanny' by cpeterso on Thursday May 17, 2018 @02:36AM (#17089275)
Another auditory illusion is the Shepard tone, which has overlapping sine waves that sound like the tone is descending or ascending without end. Wikipedia has a sample:

https://en.wikipedia.org/wiki/Shepard_tone

Re:A Linguist Explains Why 'Laurel' Sounds Like 'Yanny' by jpindar on Thursday May 17, 2018 @11:44AM (#17092305)
MyNoise.net also has that, along with some other interesting audio effects.

https://mynoise.net/NoiseMachines/shepardAudioIllusionToneGe...