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Most mammals have, compared to humans, an elongated jaw. So a little tiny bump of a mammary gland is fine, just enough to get the nostrils away from the teat, and the young can freely breathe while nursing. However, as humans started using fire more and more to cook food - which softened it up, rendering powerful jaws less necessary - their jaws began to shorten, resulting in the development of the chin and other unique facial structures as the face flattened out.

This, of course, meant that babies could suffocate while nursing, which would obviously be bad. But what if... what if nipple further from chest? Bigger bump, so baby's nose have spot to go that isn't directly into mommy's chest? Oh, turns out that works! Of course, as more and more fat stores become dedicated to growing that breast mound to keep baby from suffocating, it becomes harder and harder for the mother to reabsorb that tissue when not nursing (as many other mammals do), so they just... don't. Knockon effects from there, and bam. Tiddies.

back then i made a bunch of these but by now i lost the pic and dont know how to find the original post anymore

so anyway here is the diagram for anyone else who is interested!!

this requires pretty big carboard pieces, if you have a really big box or something you can make it from one piece, but if you don't, you can also just make each of the pieces individually and then tape them together

and then in the end you put it together like this!!

and then when you make a bunch you can put them all next to each other and stack your books like crazy