It will save the student much trouble if he learns at once to regard these auras not as mere emanations, but as the actual manifestation of the Ego on their respective planes--if he understands that it is the auric egg which is the real man, not the physical body which on this plane crystallizes in the middle of it. So long as the reincarnating Ego remains upon the plane which is his true home in the arupa levels of Devachan, the body which he inhabits is the Karana Sharira, but when he descends into the rupa levels he must, in order to be able to function upon them, clothe himself in their matter; and the matter that he thus attracts to himself furnishes his devachanic or mind-body. Similarly, descending into the astral plane he forms his astral or kamic body out of its matter, though of course still retaining all the other bodies, and on his still further descent to this lowest plane of all the physical body is formed in the midst of the auric egg, which thus contains the entire man. Fuller accounts of these auras will be found in _Transaction_ No. 18 of the London Lodge, and in a recent article of mine in _The Theosophist_, but enough has been said here to show that as they all occupy the same space (which by the way they share also with the physical health-aura), the finer interpenetrating the grosser, it needs careful study and much practice to enable the neophyte to distinguish clearly at a glance the one from the other. Nevertheless the human aura, or more usually some one part of it only, is not infrequently one of the first purely astral objects seen by the untrained, though in such a case its indications are naturally very likely to be misunderstood.