Originally Posted by
Superlad93
My favorite explanation for how Clark maintains a secret identity is the simple truth that Superman/Clark Kent is, logically speaking, the greatest method actor in the world.
You can watch movies that star Daniel Day-Lewis, Christian Bale, and Ed Norton in them and intellectually understand that they are in fact Daniel Day-Lewis, Christian Bale, and Ed Norton, but you'd be hard pressed not to get sucked into their performances so completely that you nearly divorce the character from the actor.
Method acting is a technique of acting in which an actor aspires to complete emotional identification with a part. That sounds quite a bit like what Maggin envisioned the Clark/Superman distinction as, yes? Clark Kent had his own aspirations, likes, dislikes, and so on that were totally different from Superman. This was done by Superman aspiring to realize Clark with as much verisimilitude as possible.
But this doesn't completely apply to Clark/Superman these days, does it? But, I'd argue that method acting has to apply to Clark on at least some level. He has to pretend to be cold, hot, or ill. He has to remind himself to sneeze on occasion, and it all has to be second nature to him. This is still by nature acting even though Clark is still very much part of who Superman is as a person. So, it's very likely that he does what all great method actors do: he studies his part. He knows the exact sort of facial and muscular contortions that a human body goes through for a sneeze, and he recreates it in himself. This attention to detail and first hand experience (remember, he used to function as mostly human) prevents what is known as the uncanny valley when people look at him in motion.
And why is it that Superman knowing how to make Clark sneeze in a believable way stands as the most important part of the disguise and trumps all others? It's because humans are sympathetic/empathetic creatures by nature, and their sympathetic responses are at their height when dealing with other humanoid creatures or something that has clear human responses. Just look at what happens when you play a video game or watch a CGI movie. Regardless of how good or beautiful the computer generated effects are, the main thing that gets you as a human to care about a bunch of 1s and 0s is how often it gets you to recognize familiar human characteristics. This is why you can cry your eyes out after watching Find Nemo, but you think Final Fantasy: The Spirits Within is creepy to look at even though the designs are human. You can't quite articulate it, but the cartoon fish is far more human than the nearly photo realistic humans of FF.
Superman as Clark basically makes sure to garner that empathy just by his moments and body language. The as Superman he can do things like stand unflinching in a blizzard, and have his eyes go blank for a moment as he watches cells divide. Because of this the people of the DCU are able to divorce the two in their minds, and shrug off the resemblance as nothing but a strange coincidence.