@ljwrites while working on https://fixato.org/projects/flags/flags.html?keyword_filter=korea,%20south I also learned that the black bars actually had meaning, were called #kwae / #trigrams (and that they actually different from each other, as I'd never looked close enough at it), and symbolised "the four universal elements".

Of course, as the data comes from the #CIA #WorldFactbook, I also wasn't sure how accurate the info is xD.

Didn't mention the #IChing though.