Admittedly unrelated to the original article, you may find https://www.theguardian.com/artanddesign/2020/aug/21/picture... interesting - he's been going around the country photographing those Post Office murals (I ran across this because my office is currently in a former WPA-era post office building and it is preserved in the lobby even though it hasn't been an actual post office for at least a decade - it kind of took it from "we have a weird revolutionary-war-themed painting" (it's new england, we've spent 200 years subliminally preparing to start shooting at brits again) to "this is part of a nation-wide historical collection that just happens to be in decentralised storage" :-)