Not only does the astral aura show him the temporary result of the emotion passing through it at the moment, but it also gives him, by the arrangement and proportion of its colours when in a condition of comparative rest, a clue to the general disposition and character of its owner. For the astral body is the expression of as much of the man as can be manifested on that plane, so that from what is seen in it much more which belongs to higher planes may be inferred with considerable certainty.
In this judgment of character our clairvoyant will be much helped by so much of the person's thought as expresses itself on the astral plane, and consequently comes within his purview. The true home of thought is on the mental plane, and all thought first manifests itself there as a vibration of the mind-body. But if it be in any way a selfish thought, or if it be connected in any way with an emotion or a desire, it immediately descends into the astral plane, and takes to itself a visible form of astral matter.
In the case of the majority of men almost all thought would fall under one or other of these heads, so that practically the whole of their personality would lie clearly before our friend's astral vision, since their astral bodies and the thought-forms constantly radiating from them would be to him as an open book in which their characteristics were writ so largely that he who ran might read. Anyone wishing to gain some idea as to _how_ the thought-forms present themselves to clairvoyant vision may satisfy themselves to some extent by examining the illustrations accompanying Mrs. Besant's valuable article on the subject in _Lucifer_ for September 1896.
We have seen something of the alteration in the appearance of both animate and inanimate objects when viewed by one possessed of full clairvoyant sight as far as the astral plane is concerned; let us now consider what entirely new objects he will see. He will be conscious of a far greater fulness in nature in many directions, but chiefly his attention will be attracted by the living denizens of this new world. No detailed account of them can be attempted within the space at our disposal; for that the reader is referred to No. V. of the _Theosophical Manuals_. Here we can do no more than barely enumerate a few classes only of the vast hosts of astral inhabitants.