Man I just saw the coolest geometry video called "turning a sphere outside in"!!! It's so cool what you can do in 3D theoretical spaces!
to this day i can’t tell what kind of math that is (topology? some form of geometry?) but i know it’s the cool kind
Did you find it? Make sure to watch to the end, it wraps up well and lets you really understand the concept
i did a while ago
(both the original one and the parody, both of which are equally good at what they intend to do, i have no idea which one you are referring to here so i’ve been careful to let my comments apply to both)