is that the one with dialogue commentary, which got completely deranged as it went on?

“pass through itself” does seem like cheating to me.

Mathematics are so beautiful, intuitive, logical, you look at geometry and something feels right as if the Universe itself is an harmonious flow of beauty…

…and then they invented infinities and topology and stacking squares and whatever cursed abomination allows you to recreate a second sphere by taking pieces of one sphere and rotating it and cakes you can fill with finite filling but not frost and this gif

This animation and explanation is really good!! The studio, which is guess was new at the time, was called Pixar. According to the credits, one of the animators there shares a last name with one of the mathematicians who developed this method (Thurston).

Not a physical material but a “surface”.