As I understand the Tolkien mythology, Sauron was a Maya and could therefore pretty much take whatever shape he wished - and basically has a humanoid form, of which the all-seeing Eye was a variant, or part thereof.
It also reminds me of various Cristian symbols that make use of the 'eye of God', especially masonic stuff:
The page that I nabbed the "Duck Dodgers" picture from has a long list of images of the "all-seeing eye".
It's canonical that after he lost his body in the destruction of Numenor, Sauron was no longer able to "appear fair to the eyes of men". I'm not sure if that means that he was unable to change shape at will, or if any form he chose turned out ugly (surely a judgment call? Some of those folks had weird tastes).
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It also reminds me of various Cristian symbols that make use of the 'eye of God', especially masonic stuff:
http://www.brisbanelivingheritage.com/_dbase_upl/ig_fasm_eye_god.jpg
and
http://eyemakeart.files.wordpress.com/2009/03/eye_of_god.jpg
and the 'all seing eye':
http://www.gocek.org/christiansymbols/images/allseeing.gif
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It's canonical that after he lost his body in the destruction of Numenor, Sauron was no longer able to "appear fair to the eyes of men". I'm not sure if that means that he was unable to change shape at will, or if any form he chose turned out ugly (surely a judgment call? Some of those folks had weird tastes).
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