Symbols in "Eyes wide shut"

Ritual scene from the film:


http://vigilantcitizen.com/moviesandtv/the-hidden-and-not-so-hidden-messages-in-stanley-kubriks-eyes-wide-shut-pt-i/
http://vigilantcitizen.com/moviesandtv/the-hidden-and-not-so-hidden-messages-in-stanley-kubricks-eyes-wide-shut-pt-ii/
http://vigilantcitizen.com/moviesandtv/the-hidden-and-not-so-hidden-messages-in-stanley-kubricks-eyes-wide-shut-pt-iii/

I feel quite overwhelmed, after reading so many analyses of this film and "A clockwork orange".
There may be things that have been overlooked, such as some meaning behind all the masks (which are unlikely to be random), or some connection between the men at the Rainbow store and people in the orgy, or the identities of the 2 people who nod with Bill, or how people there know Bill is an outsider, or why Alice places the mask on the pillow and what she thinks about it and why she tells him about the dream, blah blah, but these are 3 very interesting, thorough and detailed pieces nevertheless.