I thought of a way to describe it .

For instance, my car. Its inside is a mess. It's not that I don't see it or notice it, or even that I'm not bothered by it.

It's more that I think, "if I clean it now, I will have to go on cleaning it very often. And again. And again. And again. What a waste of time and energy. On the other hand, I know that if I really have to once, I can clean it quickly".

That is the Ni > Si perspective (not just a justification for laziness ) -- I am looking at the longer-term implications of having to clean it again and again.

The same goes for a hair cut. A good way for spotting LIE men: none will be wearing (consistenly) a crew cut. To keep it short, it has to be trimmed very very often, and LIEs would hate to waste time with something that, in the longer run, is of lesser importance. So they go for haircuts that need to be kept less often.

I think this thought "overflows" into the unconscious so that a few things are not really noticed anymore, but that is the basic explanation.