Supposing an astral object to be made of the matter of the second and third subdivisions mixed, a man living in the astral world could perceive that object only if on the surface of his astral body there were particles belonging to the second and third subdivisions of that world which were capable of receiving and recording the vibrations which that object set up. A man who from the arrangement of his body by the vague consciousness of which we have spoken, had on the outside of that vehicle only the denser matter of the lowest subdivision, could no more be conscious of the object which we have mentioned than we are ourselves conscious in the physical body of the gases which move about us in the atmosphere or of objects built exclusively of etheric matter. During physical life the matter of the man's astral body is in constant motion, and its particles pass among one another much as do those of boiling water. Consequently at any given moment it is practically certain that particles of all varieties will be represented on the surface of his astral body, and that therefore when he is using his astral body during sleep he will be able to "see" by its means any astral object which approaches him. After death, if he has allowed the rearrangement to be made (as from ignorance, all ordinary persons do) his condition in this respect will be different. Having on the surface of his astral body only the lowest and grossest particles, he can receive impressions only from corresponding particles outside; so that instead of seeing the whole of the astral world about him, he will see only one-seventh of it, and that the densest and most impure. The vibrations of this heavier matter are the expressions only of objectionable feelings and emotions, and of the least refined class of astral entities. Therefore it emerges that a man in this condition can see only the undesirable inhabitants of the astral world, and can feel only its most unpleasant and vulgar influences. He is surrounded by other men, whose astral bodies are probably of quite ordinary character; but since he can see and feel only that which is lowest and coarsest in them, they appear to him to be monsters of vice with no redeeming features. Even his friends seem not at all what they used to be, because he is now incapable of appreciating any of their better qualities. Under these circumstances it is little wonder that he considers the astral world a hell; yet the fault is in no way with the astral world, but with himself--first, for allowing within himself so much of that cruder type of matter, and, secondly, for letting that vague astral consciousness dominate him and dispose it in that particular way. The man who has studied these matters declines absolutely to yield to the pressure during life or to permit the rearrangement after death, and consequently he retains his power of seeing the astral world as a whole, and not merely the cruder and baser part of it.