Anon
Maybe it’s the desperate neediness of social media which makes an anonymous image (or any human-made artefact, a phrase, an object.. coming out of no-where and from apparently no-one) leave such a deep impression
While anonymity is the dark side of marketing, it does suggest that there is a generosity at work when the maker and the market is absent.
It makes the writing on a supermarket wall like discovering an ancient relic; something mysterious and wonderful is revealed when faced with a primal aesthetic fact.