Most of us have seen various Escher pictures of structurally-impossible objects like the never-ending Penrose staircase -
Now that's disturbing enough for me - but THIS auditory illusion is possibly worse (a "Shepard tone")... And no, I did not listen to 10 hours of it.....
and some detail about it here - https://en.wikipedia.org/wiki/.....epard_tone
I seriously recommend not copying my mistakes. D'oh -
Please make your own, different mistakes, and help us all learn :-)