Was pondering it because of reading stories where it really was like the masquerade. In fact, in one, it was -- the reason why a simple domino mask would hide an identity (at least until the talking dog smelled you out) was the same magic that let a man with goat legs walk down Wall Street unnoticed. In another, it was a pervasive effect, not controlled by any known being.
But, while they have the motives down pat unlike many masquerades, the convention is that a domino mask hides your identity, just as a character in an Elizabethan play speaks blank verse.
Makes me muse. There are no secret identities in Through A Mirror, Darkly or in another super tale I'm working, despite their integral part in the genre. (Except for some supervillains for obvious reasons.) But I had had another idea where they were part, and it's stirring. Then, the hero has as good as reason as the supervillains normally do. . . .