SEIs and Si
As I saw there was still some discussion as to whether non Si egos understood what Si is, I wrote the following. If you think I missed something, put forward your question.
Si is, before anything, the constant awareness of how the environment affects the nervous system. Causing a sensitivity that prompts the person to always be trying to come back to their center. Imagine having a hard day at the office and that you picture a Caribbean beach to relax. Notice the beach is out of reach for analysis. Its only function is to de-stress you by whatever associations you mind imposes on it. This is why the ‘impressions’ are hard to describe. The object that serves as a fuse can be anything: a piece of music, a scenery, a vibe, “the future”, the display of a specific sentence in a text… Jung was on track when he described objects as holding the subject under a spell: the impression is always jovial as it keeps its novelty. Some can be toyed with an this can turn the experience into a surpisingly exacting and texturized one at times*. If in the middle of this ‘trance’ the person looks at the process as if from outside, they will be able to say some possess somewhat of a brilliance, a shade, a taste. An impactful stimulus can go the distance to induce strong physical reactions (being sexually aroused by a beautiful building, for example).
*How a creative SEI would go about creating art would be a continuation of this. It follows from this the suitable means the SEI will be partial to: poetry over novel writing, for example.