In the physical body these centres are: (1) at the base of the spine, (2) at the solar plexus, (3) at the spleen, (4) over the heart, (5) at the throat, (6) between the eyebrows, and (7) at the top of the head.

There are other dormant centres, but their awakening is undesirable.
The shape of all the higher bodies as seen by the clairvoyant is ovoid, but the matter composing them is not equally distributed throughout the egg.

In the midst of this ovoid is the physical body.

The physical body strongly attracts astral matter, and in its turn the astral matter strongly attracts mental matter.

Therefore by far the greater part of the matter of the astral body is gathered within the physical frame; and the same is true of the mental vehicle.