@johncarlosbaez I have this vague memory that somewhere in Wittgenstein, he says that if you were walking down the street and there was something there utterly foreign, or unknown to you, that you wouldn’t see it. Maybe there has to be some sort of psychological twist to make the unseen seen or something. Dark matter is dark because we don’t know how to see it and thus we don’t know what it looks like. Can math function as a corrective lens to focus our eyes on what’s out there?