HappMacDonald parent
To me most of these look like the procedure for the topological inversion of a sphere stopped halfway.
Do you mean a sphere eversion? :)
Shoutout to my fav math visualization BITD https://www.youtube.com/watch?v=wO61D9x6lNY
Shoutout to my fav math visualization BITD https://www.youtube.com/watch?v=wO61D9x6lNY