He withdrew to a house in the south to write art history, dismissed anti-German activists with lectures about realism (not a quality that loomed large during any other period of his life) and maintained friendly relations with a ferocious collaborationist, Pierre Drieu la Rochelle.
It's great for vocal recording and other musical applications, as well as podcasts, lectures, and more, and it enables better quality recordings than can be obtained with a mobile device's built-in mic.
In 1954 he was invited to Japan to give a series of lectures which were subsequently credited by the Japanese with having been the basis of their quality-focused post-war industrial economy.