I see a thing. It makes an impression on my psyche. Psyche defined as my cognitive self. The network of thoughts that are mine.
This is perception.
Ni, would be, then, the reverse of this. Reverse perception.
I see a thing. My psyche accepts the thing as real, outside of the self. (As opposed to perception, where the thing might very well be just a perception.) It, the psyche, then chooses how it will process this thing. Instead of seeing the thing as making an impression on the psyche...you see the psyche as making an impact on the thing.
More concretely. A stop sign is red. You perceive the perception of red as true, but you don't accept the red as true. This is straignt perception.
But, if you were to let to let the external be accepted as true, you then trust that the redness is outside of the psyche. It isn't a perception anymore, but an intuition. And you could easily color that intuition however you like. You could accept that the stop sign is actually yellow instead of red, even though it is red.
It's hard to explain.
But since this process is all internal, except for the initial external, and it is intuition, I'd have to call it Ni.
If so, I suck at it.