The dreaming body and the barrier of perception are positions of the assemblage point, and that knowledge is as vital to seers as knowing how to read and write is to modern man. Both are accomplishments attained after years of practice.
The dreaming body is known by different names. The name I like the best is, the Other. We can be in two places at once, we can experience a sort of perceptual dualism. There is no end to the mystery of man and to the mystery of the world.
The only thing that soothes those who journey into the unknown, is oblivion. What a relief to be in the ordinary world!
For warriors, there are two positions of the assemblage point where there are no more doubts. In one you have no more doubts because you know everything. In the other, which is normal awareness, you have no doubts because you don't know anything.
No rational assumptions should interfere with the actions of a seer. Rationality is a condition of alignment, merely the result of the position of the assemblage point. You have to understand this when you are in a state of great vulnerability. To understand it when your assemblage point has reached the position where there are no doubts is useless, because realizations of that nature are commonplace in that position. It is equally useless to understand it in a state of normal awareness; in that state, such realizations are emotional outbursts that are valid only for as long as the emotion lasts.
You can travel by waking up at a distant dreaming position. By moving your assemblage point from normal awareness all the way to the position where the dreaming body appears, your dreaming body can actually fly over incredible distances in the blink of an eyelid. The mystery is in the dreaming position. If it is strong enough to pull you, you can go to the ends of this world or beyond it, just as the old seers did. They disappeared from this world because they woke up at a dreaming position beyond the limits of the known.

There is no way of knowing how it is done. Strong emotion or unbending intent, or great interest serves as a guide; then the assemblage point gets powerfully fixed at the dreaming position, long enough to drag there all the emanations that are inside the cocoon.