"Each man makes one ego for himself, although it is subject to enormous variation because of its instability, ***and one for everyone he perceives***, which is equally variable." UrT4C2
Did you know you've made an ego for other people, just as much as you've put an ego inside yourself? That's what he's saying. You have invented an ego for other people and you interact WITH that ego rendition of the person rather than seeing them for who they are. And we're not talking here about just seeing them as a body, but even overlaying their body with another layer of modification.
He's also goes on to say that as your ego and the ego you made for another interact, they change and affect each other.
"Their interaction IS a process which literally alters both, because they were not made either BY or WITH the unalterable.
"It is particularly important to realize that this alteration can and does occur as readily when the interaction takes place IN THE MIND as when it involves physical presence. THINKING about another ego is as effective in changing relative perception as is their physical interaction." UrT4C2
For me I was quite shocked to realize that I had made an ego for a particular person, and I was interacting with it. And this ego was a very reduced view of that person. It focused on their body only, seeing their body as though it was all there was to the person. In fact, strangely even seeing the person as if they had NO mind at all and were entirely physical. All sense of them even being there or having a presence or personality was mostly gone, replaced by a seemingly empty shell of an appearance.
It was also shocking to see that I was interacting with that ego and not with the person. I was not giving them any credit and was not seeing past their body form. I had taken their body form to be them almost entirely and was very blind to anything else. I now had a special relationship that had stripped that person down so much that it felt like I was interacting with a small child who was regarded as defective and weak and very sinful and treacherous.
It was strange to realize I was even doing this. And when I realized I was doing this I also realized I could step back from that version of them and get outside of it, to take a look at the person more directly and with more presence. It wasn't just "my ego" that was causing a clouding of how I see. It was the fact that I had also produced a kind of "mirror" ego that was projected onto that person and had substituted for them. That ego or "image" of a self was now masquerading as them to my awareness, and I was relating only to it. I was in a relationship with a fantasy character.
I then thought to myself, I don't even know how I got into this state. How did this happen? How could I have built up such a false view of a person that was so out of touch with them it made it seem like the person wasn't even barely there any more. That the person seemed to be so different from how they used to be that I barely recognized them, as if I thought that person was not even really there anymore, and yet they were.
So now begins the task of dismantling the egos we've made not just for ourselves but even for other people. These are narrow, condemned, faulty, dysfunctional, guilty senses of identity which have become counterfit selves standing-in for other people. It's now not simply just a matter of my finding out what my own real identity is, it's also a matter of finding out what is the true identity of others. Have I even seen them really? Do I even know what they're really like? It's not just that I'm not my thoughts or emotions or body, they're not theirs either, and they're not the version of them that I made up.
For sure my ego has a dominating tyrannical overpowering and attacking view of others. But in fact its view of what I think is them is in fact a view of further egos that my mind believes exists. Its relationship is with these artificial figures that aren't even the actual persons. It has special relationships with these "dream figures" like in a private world, subjectively interpreting that these make-believe fictional entities are actually out there to be interacted with, and that this is all that's there.
"Who sees a brother's body has laid a JUDGMENT on him, and sees him not. He does not REALLY see him as sinful; he does not see him at all. In the darkness of sin, he is INVISIBLE. He can but be IMAGINED in the darkness, and it is here that the illusions you hold about him are NOT held up to his reality. Here are illusions and reality kept SEPARATED. Here are illusions NEVER brought to truth, and ALWAYS hidden from it. And here, in darkness, is your brother's reality IMAGINED as a body, in unholy relationships with other bodies, serving the cause of sin an instant, before he dies." UrT20H6
"Can the ego teach truly, when it overlooks truth? Can it perceive what it has DENIED? Its witnesses DO attest to its DENIAL, but hardly to WHAT it has denied. The ego looks straight at the Father and does not see Him, for it has denied His Son." UrT10F17
"The other has many forms, for the content of INDIVIDUAL illusions differs greatly. But they have one thing in common; they are all insane. They are made of sights which are NOT seen, and sounds which are NOT heard. They make up a PRIVATE world which CANNOT be shared. For they are meaningful ONLY to their maker, and so they have no meaning at all. In this world their maker moves alone, for only HE perceives them.
Each one peoples his world with figures from his INDIVIDUAL past, and it is because of this that private worlds DO differ. But the figures that he sees were NEVER real, for they are made up ONLY of his REACTIONS to his brothers, and do NOT include their reactions to HIM. Therefore he does not see that he made them, and that they ARE NOT WHOLE. For these figures HAVE NO WITNESSES, being perceived in one SEPARATE mind only.
It is THROUGH these strange and shadowy figures that the insane relate to their insane world. For they SEE only those who remind them of these images, and it is to THEM that they relate. Thus do they communicate with those who ARE NOT THERE, and it is THEY who answer them. And no-one hears their answer save him who called upon them, and he ALONE believes they answered him. Projection MAKES perception, and you CANNOT see beyond it. Again and again have men attacked each other, because they saw IN THEM a shadow figure in their private world." UrT12E1