“Seth material” search engine (Jane Roberts)

I am particularly concerned, you see, with this matter of projection, simply because your own abilities will rather swiftly lead you along in that direction. Therefore whatever information I can give you will be of great practical benefit. I do not want either of you traveling about unless you know what you are doing.

Without such recognition however an encounter could be unpleasant. You have little control, and I am speaking here now all evening, of projections and their circumstances—you will have little control over the constructions of others. If, for example, during projection travel you encounter a disturbing image, you must first will it to disappear. If it is a subconscious fabrication it will vanish, but if you do not will it to vanish it will remain, and then you must deal with it as a reality.

We have explored the various forms in which you may travel. I have also told you that the form in which you find yourself can be a tip-off to you. If your levitation experience seems to carry you outside of your solar system, then you know that you are using the third form, and that your abilities for the time are almost limitless, comparatively speaking. Any image that you see in any case must be accepted. Now. Physically speaking it does no good to call such images hallucinations, for they are no more hallucinations than the chair in which my friend Ruburt now sits.

(Astral Projection, by Oliver Fox. University Books.)

You may or may not have the sensation of traveling through the doors or windows. This is dependent upon the particular kind of projection involved. The molecular structure of the projecting self is of a different nature. There is no change in the physical nature of the door, for example. The molecular structure of the traveling self changes.