I believe in a form of collective unconscious but I relate it
   more to "things in common" simply by being human. Our societies
   are all similar. Our needs are all similar. Our hopes and dreams
   are all similar. But we use different types of symbolism to
   express difficult concepts with depending upon our cultures,
   which is why different cultures use different types of
   symbolism. Egypt has its set of symbolisms. Christian cultures
   (the West is a Christian culture steeped in Christian symbolism)
   have theirs, Chinese culture has theirs, Japanese culture has
   theirs.

   They can all be tied together of course; the specifics differ
   but the underlying concepts are more-or-less similar.

   Is it a collective unconsciousness? Of a sort, yes.*

   We can even level up to Gaia; from a long-away perspective, we
   could be considered "one life form" on this planet. Like a slime
   mold oozing over the planet over billions of years, dependent
   upon the systems of this planet for birth, life, death,
   reconstruction, rebirth and continuation into myriad
   metaphorphized forms.

   In that sense, all life is one and connected, and it's not
   unreasonable that being similarly patterned as humans that we
   would have similar unconsciousnesses.

   Is there a deeper connection? Quite possibly.*

   I'm a fan of embodied cognition and with that, the brain, the
   body and the environment and our social relationships are all
   "one thing", like a machinery with invisible wires that we just
   can't see or measure at present using scientific tools, but
   we're certainly aware of in day-to-day life via communication,
   feelings, words, etc.

   Even here; are you an I physically connected in some way?

   Absolutely. My brain and yours are linked across the gaps of
   Time as we negotiate meaning as we communicate.

   So it's not unreasonable to me to consider a collective
   unconsciousness as being a tangible reality.