The feeling these shapes cause I like to call "unresolveable unfamiliarity".
Normally, when a being experiences unfamiliarity, it can resolve it, by gaining additional experiences, knowledge, or simply getting accustomed to circumstances. Even if it never does so, it feels that it can.
But with these interactions, the unfamiliarity is caused by something that a 3D being is physically incapable of becoming familiar with. It, quite literally, cannot wrap it's head around what's going on. Thanks to our intellect, we can mathematically explain, even simulate what's going on, but we cannot get accustomed to it.
Bear in mind that this is only my opinion, coming from someone who knows next to nothing about psychology though :-)
it's quirky to know that this is familiar to our brains perhaps but can only be accessed outside of the facilities of our 5 senses. I like to imagine that is our experience on LSD and psilocybin with our brains in different focus
