It’s like modernism but with instead of explaining in logical/rational/absolute terms, post-modernism is explained in subjective terms.
Modernism assumes the absolute and essential.
Post modernism assumes no-absolute and that there are no essentials.
Analogy: Classical physics is modernism.
Quantum physics (post late 1920s), is post modernism, first via statistics then post 1960s in the various and sundry narratives.
“ Didn’t Post-Modernism discover that the relativism of Modernism wasn’t relativistic enough, demonstrating that the Modernist critique of long standing Western Absolutes still maintained itself on essentialist binaries?
I *could* go into the issue of the deep binary of Platonic relations and the issue of the artificial division between “mind and body” or “inner and outer worlds” that goes back to the beginnings of Western philosophy but you said that and said it so succinctly, my “Yup” was a Yup of “Impressive!” – you covered it all.
Our very languages in the West have grown with these essential binaries/dualities built into them, making discussing things in a post-modernist manner very difficult at times, which is why it sounds so strange to people not accustomed to it.