Alice Bailey is often viewed as a prolific writer, mystic the founder of an international esoteric movement.  She wrote extensively about what she termed, 'the etheric body' as the mould of the physical body. Another way to put it is that on which the dense physical form is built.  Imagine what lies beneath what you may see. Consider these six key points:

1) Everything in the universe is energy.  This etheric level can be subtle and invisible, yet controls, governs and conditions all things in the manifested physical world.

2) This etheric body creates, changes and qualifies what you perceive. This etheric is subject to ceaseless change. This being true of the Macrocosm, human beings, the microcosm.  It can mysteriously prove true of all the subhuman kingdoms in nature. Of this, the animal kingdom and the vegetable kingdom are already widely perceived.

3) The etheric body is composed of interlocking and circulating lines of force.  They emanate from one or other, or from one or many, of the seven planes or areas of consciousness of our planetary life.  Some human beings evolve to view this as a grid.

4) This energy system has seven focal points within the etheric body. These centres are related to certain types of incoming energy. When the energy reaching the etheric body is not related to a particular centre, then that centre remains unawakened. When it is related and the centre is sensitive to impact, then that centre becomes vibrant, receptive and develops as a controlling factor in the life of the man on the physical plane.

5) The physical body is perceived based on how you discern your energies.  Your dense physical body, composed of atoms  (each with its own life, light and activity) is held together by and expresses energies which compose the etheric.

6) The etheric body has many centres of force, responsive to the inflowing energies of our planetary Life, but we shall consider only the seven major centres which respond to the inflowing energies of the seven rays. All lesser centres are conditioned by the seven major centres. Knowledge of the ego and of the personality rays is useful.