This essay appeared in The Comics Journal Recently. It's about the blandness of Superman's face. There's nothing distinguished about it. It makes comparisons to Batman, etc, being masked and therefor more interesting. There are some provocative thoughts here, but most notable is this
And this is why Superman actually remains unique. He is the unfinished and irresolvable superhero. there have been debates about which is his aspects is the ego, and which is the alter ego, but really it's a chicken and egg scenario; neither had priority. He arrived as an infant, tabula rasa, and the very first time his adoptive parents concealed his super-baby traits, he was split in two by a super-secret concerning his identity. He was always both Superman and Clark, or he is forever neither of them, two possibilities that are equally chilling.
I'm reminded again and again of the idea that the interpretation tells us more about the interpreter than about the text.