Why do we often associate “higher” sounding vowels (E, A, I) with sharp edges and “lower” sounding vowels (O, U) with round/dull/circular edges?

Question

A wiki on the topic https://en.m.wikipedia.org/wiki/Bouba/kiki_effect

In: Other

Answer 1

It may have something to do with the literal way that we make those sounds with our mouths, make an o or u sound and you will find your mouth contorting to that shape, we see other people make the o sound and so that’s the association that cements in our minds, since it’s the same mouth shape for that sound globally, it becomes a universal concept that o is round.