First I heard brainstorm, then green needle and then brain needle, ha ha! Yeah that was weird! Found a related video that talks a bit about this sort of thing:

First I heard brainstorm, then green needle and then brain needle, ha ha! Yeah that was weird! Found a related video that talks a bit about this sort of thing: https://www.youtube.com/watch?v=yDiXQl7grPQ https://www.youtube.com/watch?v=yDiXQl7grPQ Also related is this one that I remember seeing on HN or Reddit a while back: https://soundcloud.com/whyy-the-pulse/an-audio-illusion https://soundcloud.com/whyy-the-pulse/an-audio-illusion. There is an article about that one as well at https://gizmodo.com/this-audio-illusion-will-make-you-never-trust-your-ears-1593113324 https://gizmodo.com/this-audio-illusion-will-make-you-never-... but I never bothered to read the article because I think the audio recording is sufficiently interesting in its own right.