Except, the Clark Kent persona is portrayed as the kind of person no one sees even when they’re talking to him.

He gets his work done well, but not so well as to stand out. He doesn’t win awards or receive accolades. He never asks anyone to drop him off at the airport or help him move. He doesn’t ever call out sick or do anything else that would draw attention. He doesn’t get drunk at the office Christmas party. Automatically friend-zoned by every woman he meets, not because there’s anything wrong with him, but just because there’s nothing right about him. He’s not the guy you ask out. He’s the guy you ask to watch your cat so you can go on vacation with someone else. He’s only noticed in his absence, and then he’s quickly forgotten when he returns.

Lots of people like that are completely invisible.