It is not improbable that other sentient beings have organs of sense which do not respond to some or any of the rays to which our eyes are sensitive, but are able to appreciate other vibrations to which we are blind. Such beings would practically be living in a different world to our own. Imagine, for instance, what idea we should form of surrounding objects were we endowed with eyes not sensitive to the ordinary rays of light, but sensitive to the vibrations concerned in electric and magnetic phenomena. Glass and crystal would be among the most opaque of bodies. Metals would be more or less transparent, and a telegraph wire through the air would look like a long narrow hole drilled through an impervious solid body. A dynamo in active work would resemble a conflagration, whilst a permanent magnet would realise the dream of mediaeval mystics, and become an everlasting lamp with no expenditure of energy or consumption of fuel.[18] Kamaloka is a region peopled by intelligent and semi-intelligent entities, just as our own is thus peopled; it is crowded, like our world, with many types and forms of living things, as diverse from each other as a blade of grass is different from a tiger, a tiger from a man. It interpenetrates our own world and is interpenetrated by it, but, as the states of matter in the two worlds differ, they co-exist without the knowledge of the intelligent beings in either. Only under abnormal circumstances can consciousness of each other's presence arise among the inhabitants of the two worlds; by certain peculiar training a living human being can come into conscious contact with and control many of the sub-human denizens of Kamaloka; human beings, who have quitted earth and in whom the kamic elements were strong, may very readily be attracted by the kamic elements in embodied men, and by their help become conscious again of the presence of the scenes they had left; and human beings still embodied may set up methods of communication with the disembodied, and may, as said, leave their own bodies for awhile, and become conscious in Kamaloka by the use of faculties through which they have accustomed their consciousness to act. The point which is here to be clearly grasped is the existence of Kamaloka as a definite region, inhabited by a large diversity of entities, among whom are disembodied human beings. From this necessary digression we return to the particular human being whose fate, as a type, we may be said to be tracing, and of whose dense body and etheric double we have already disposed. Let us contemplate him in the state of very brief duration that follows the shaking off of these two casings. Says H.P. Blavatsky, after quoting from Plutarch a description of the man after death: Here you have our doctrine, which shows man a _septenary_ during life; a _quintile_ just after death, in Kamaloka.[19]