Maybe this is known to some of you, but I'm sure it's not known to the lot of you...
I was kicking some thoughts around in my head the other day, and I realized that all NJs (INTJ, INFJ, ENTJ, ENFJ) are either Ni doms or Ni auxs.
At the same time, all NPs (INTP, ENTP, INFP, ENFP) are Ne doms or Ne auxs.
Then I realized that something similar holds true for Ss.
All SJs (ISTJ, ESTJ, ISFJ, ESFJ) are Si doms or auxs, and all SPs (ESFP, ISTP, ESTP, ISFP) are Se doms or auxs.
Accordingly, all Pi doms or auxs are Judgers, and all Pe doms or auxs are Perceivers.
So, my question to you is: what is it about having Pi (Ni,Si) as your dom or aux that makes one a Judger, and what is it about Pe (Ne,Se) as your dom or aux that makes one a Perceiver?