The shades and colors of the aura present an ever changing kaleidoscopic spectacle, of wonderful beauty and most interesting character. The trained occultist is able to read the character of any person, as well as the nature of his passing thoughts and feelings, by simply studying the shifting colors of his aura. To the developed occultist the mind and character become as an open book, to be studied carefully and intelligently. Even the student of occultism, who has not been able to develop the clairvoyant vision to such a high degree, is soon able to develop the sense of psychic perception whereby he is able to at least "feel" the vibrations of the aura, though he may not see the colors, and thus be able to interpret the mental states which have caused them. The principle is of course the same, as the colors are but the outward appearance of the vibrations themselves, just as the ordinary colors on the physical plane are merely the outward manifestation of vibration of matter. But it must not be supposed that the human aura is always perceived in the appearance of a luminous cloud of ever-changing color.