It really hasn't got anything to do with divination, or even Shamanism.
The concept of Tulpa is rooted in Tibetan Bon tradition,which is both Shamanic and Animistic.And any practice which is defined with the mancy suffix relates to divinatory skills also.
I'm not on board with the latest trends and this one seems typical of the careless throwing together and conflation of older traditons and concepts that occurs when someone has a new trick to sell to the masses.
. Generally the people creating these thought forms don't seem to really grasp what they are doing or how it might connect to anything outside their head..
Seconded and QFT.
Rather like the Eclectic Wiccan craze that caused the Bicca/Bitchcraft wars a while ago:Purple sparkly unicorns and totems for all!
Is Llewellyn involved yet? [ LOLGROAN [crazy] [tongue] ]
I did a lot reading around last night after seeing this term here and I'm not impressed at all by what I've found so far.Just saying.
But,It does go a long way towards explaining the relatively sudden and apparently unusual clusters/proliferation of shadow forms and strange 'demons' that several of my friends have been asked to deal with recently.
I asked around about this too and showed a few 'popular' pages on it to folk I know.
They're not too impressed either.
A quick forum search on Tulpa below,we've answered a fair few questions on this subject already and there are lots of archived topics relating to this too:
http://www.occultforum.org/forum/search.php