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Beautiful sky
The best description of Ni I read is "when you take away all other functions, Ni is what's left". Sure, it sounds dumb because you can technicaly say this of all functions, though Ni is so abstract and personal that it's the best way to put it imo.
Explaining any other function with this statement would be dumb... anyhoo.
Ni starts a blank canvas that is painted of life experiences and paterns, possible outcomes arise, "if"s... so it comes up different for each individual, it works only in certain settings. A life changing event ("life changing" can vary greatly among individuals) can mess it up because all is left to experience again. Ni is so tangible because it is all you have lived, and so abstract for the same reason... Words serve no purpose at this point, it can't be told, only experienced.
It's not because explaining is impossible that it means a lack of comprehension, somethings simply cannot be told.
"Making the unconscious conscious" is easier, or more visible, in some case than others.