Si creates impressions of events, and sometimes that "shadow" of an event is remembered more clearly for me than the physical details of the event.
Ni should work in a way very similar to this, shouldn't it? Except that the information is taken about more abstract events. Is that possible--impressions about abstract themes and information? Impressions already seem to be "abstract" things.
Maybe I'm making the mistake of extending Si into Si-Fi, remembering my evaluation of how I feel about an event.
Maybe it's just because they are both introverted perceiving functions, and are bound to be fairly abstract and subjective. Are Ni and Si giving "interpretations" of things, without evaluating and judging? Is that possible?
Maybe it sounds like a vague function because it has not been attached to Te yet? I think extending it to Si-Te would make it look a lot more tangible. We would expect sensing functions to already look tangible, but actually I think adding Te enhances that a lot in the case of Si (or at least, for the way I'm thinking about "tangible" things).
What are your thoughts about any of it? I'm looking for feedback.