As the ego unfolds his latent possibilities through the long course of his evolution, the higher matter is gradually brought into action, but it is only in the perfected man whom we call the Adept that it is developed to its fullest extent.

Such matter can be discerned by clairvoyant sight, but only by a seer who knows how to use the sight of the ego.
It is difficult to describe a causal body fully, because the senses belonging to its world are altogether different from and higher than ours at this level.

Such memory of the appearance of a causal body as it is possible for a clairvoyant to bring into his physical brain represents it as ovoid, and as surrounding the physical body of the man, extending to a distance of about eighteen inches from the normal surface of that body.

In the case of primitive man it resembles a bubble, and gives the impression of being empty.

It is in reality filled with higher mental matter, but as this is not yet brought into activity it remains colourless and transparent.