Page "Clark Kent" Paragraph 24
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* Another reason given in the 1987 story " The Secret Revealed " was the public simply does not know that Superman has a secret identity, considering he does not wear a mask, which implies to most that he has nothing to hide.
As an added precaution, Superman would vibrate his face slightly ( like Jay Garrick, the Golden-Age Flash ), so that photographs would only show his features as a blur, thus preventing the danger of photographs of both identities being reliably compared.
The 2004 series Superman: Birthright also explained that Superman's eyes are an inhumanly vivid shade of blue, which Clark's glasses diffuse to make his eyes appear more human.
A new element that has shown up recently is the fact that most people only know of Clark as a name in a byline, and only see Superman from a distance, if they see him at all.
As most people don't spend a lot of time with both Clark Kent and Superman the similar appearance doesn't come up.
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