Astral sight, when it is cramped by being directed along what is practically a tube, is limited very much as physical sight would be under similar circumstances; though if possessed in perfection it will still continue to show, even at that distance, the auras, and therefore all the emotions and most of the thoughts of the people under observation.
There are many people for whom this type of clairvoyance is very much facilitated if they have at hand some physical object which can be used as a starting-point for their astral tube—a convenient focus for their will-power. A ball of crystal is the commonest and most effectual of such foci, since it has the additional advantage of possessing within itself qualities which stimulate psychic faculty; but other objects are also employed, to which we shall find it necessary to refer more particularly when we come to consider semi-intentional clairvoyance.
In connection with this astral-current form of clairvoyance, as with others, we find that there are some psychics who are unable to use it except when under the influence of mesmerism. The peculiarity in this case is that among such psychics there are two varieties—one in which by being thus set free the man is enabled to make a telescope for himself, and another in which the magnetizer himself makes the telescope and the subject is simply enabled to see through it. In this latter case obviously the subject has not enough will to form a tube for himself, and the operator, though possessed of the necessary will-power, is not clairvoyant, or he could see through his own tube without needing help.
Occasionally, though rarely, the tube which is formed possesses another of the attributes of a telescope—that of magnifying the objects at which it is directed until they seem of life-size. Of course the objects must always be magnified to some extent, or they would be absolutely invisible, but usually the extent is determined by the size of the astral tube, and the whole thing is simply a tiny moving picture. In the few cases where the figures are seen as of life-size by this method, it is probable that an altogether new power is beginning to dawn; but when this happens, careful observation is needed in order to distinguish them from examples of our next class.
3. By the projection of a thought-form.—The ability to use this method of clairvoyance implies a development somewhat more advanced than the last, since it necessitates a certain amount of control upon the mental plane. All students of Theosophy are aware that thought takes form, at any rate upon its own plane, and in the vast majority of cases upon the astral plane also; but it may not be quite so generally known that if a man thinks strongly of himself as present at any given place, the form assumed by that particular thought will be a likeness of the thinker himself, which will appear at the place in question.
Essentially this form must be composed of the matter of the mental plane, but in very many cases it would draw round itself matter of the astral plane also, and so would approach much nearer to visibility. There are, in fact, many instances in which it has been seen by the person thought of—most probably by means of the unconscious mesmeric influence emanating from the original thinker. None of the consciousness of the thinker would, however, be included within this thought-form. When once sent out from him, it would normally be a quite separate entity—not indeed absolutely unconnected with its maker, but practically so as far as the possibility of receiving any impression through it is concerned.
This third type of clairvoyance consists, then, in the power to retain so much connection with and so much hold over a newly-erected thought-form as will render it possible to receive impressions by means of it. Such impressions as were made upon the form would in this case be transmitted to the thinker—not along an astral telegraph line, as before, but by sympathetic vibration. In a perfect case of this kind of clairvoyance it is almost as though the seer projected a part of his consciousness into the thought-form, and used it as a kind of outpost, from which observation was possible. He sees almost as well as he would if he himself stood in the place of his thought-form.
The figures at which he is looking will appear to him as of life-size and close at hand, instead of tiny and at a distance, as in the previous case; and he will find it possible to shift his point of view if he wishes to do so. Clairaudience is perhaps less frequently associated with this type of clairvoyance than with the last, but its place is to some extent taken by a kind of mental perception of the thoughts and intentions of those who are seen.
Since the man's consciousness is still in the physical body, he will be able (even while exercising the faculty) to hear and to speak, in so far as he can do this without any distraction of his attention. The moment that the intentness of his thought fails the whole vision is gone, and he will have to construct a fresh thought-form before he can resume it. Instances in which this kind of sight is possessed with any degree of perfection by untrained people are naturally rarer than in the case of the previous type, because of the capacity for mental control required, and the generally finer nature of the forces employed.
4. By travelling in the astral body.—We enter here upon an entirely new variety of clairvoyance, in which the consciousness of the seer no longer remains in or closely connected with his physical body, but is definitely transferred to the scene which he is examining. Though it has no doubt greater dangers for the untrained seer than either of the methods previously described, it is yet quite the most satisfactory form of clairvoyance open to him, for the immensely superior variety which we shall consider under our fifth head is not available except for specially trained students.