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thehotelambush, I think of Se as sensing the external world and exerting personal force on it. I think of Si as sensing one’s internal world (comfort and health) and ensuring that one has the personal resources to maintain that health and comfort.
The difference could be illustrated by imagining the senses of a simple robot. The robot has Se sensors which monitor the outside world and Se actuators which exert force upon it. But it also has Si sensors which monitor its internal energy levels, temperature, function health, and subroutines which keep track of the external sources of energy and maintenance areas for rest and repair.
You can see the difference in the interests and actions of Se-doms and Si-doms. The former are interacting with the external world and the latter are taking care of their inner world.
Since Si-users focus so much on their own internal state of comfort, they tend to focus less on the external world, except where doing so would increase their personal comfort or health levels. Other than that, they tend to retreat from the hustle and bustle of the world. This means that once they have a certain level of comfort, they stop interacting.
They still see the world go by, but they aren’t naturally adept at mixing in with it the way Se-users are. This doesn’t mean that they don’t want to interact, but it means that they tend to fall into comfortable routines where nothing new ever happens. Thus, they seek novelty, but it has to be a safe (self-preserving) form of novelty. Not Se action, but rather Ne alternative possibilities.
IEE’s don’t actually force (Se) SLI’s to do something. They first and foremost keep at them to get them to focus on the external world, and once they have the SLI’s attention, they offer endless suggestions as to what they can do together. The SLI can then select something that sounds fun and interesting but is not too dangerous.
*EDIT*
After looking over what I just wrote, I see that this also applies to ILE’s and SEI’s. ILE’s offer endlessly new things to SEI’s, and SEI’s in turn offer health, indulgence, and appreciation to ILE’s.
And if there is one thing, only one thing, that an SLI wants, it is to be appreciated.