The Illusion of Separateness....

The illusion of separateness which appears as an integral part of present human experience arises from our earthly pre-occupation with self, and the density of the Earth environment in which we live. Both these factors tend to close us off from one another and from the higher worlds of Creation. An opening of awareness to the unseen worlds around us is an important element in New Age thinking; this requires that we draw from occult science more detailed information on the nature of vibrations and densities, so that we may understand in turn the different levels or planes of existence.
Occult science explains that matter is made up of various groupings and combinations of atoms with their orbiting electrons and protons, all of which oscillate about each other in a positive-negative vibratory movement, maintaining a magnetic spacing from each other.
All atoms, and the matter which they constitute through their cohesive groupings, are vibrating at different frequency rates dependent on their complexity and density; a low frequency allows a dense grouping of atoms, a higher frequency creates a less dense, more spaced-out and refined matter. This in turn reflects their distance from the Creative Thought-Center; the refined matter of higher frequency vibration is nearer the Center, while the denser matter of lower frequency exists at the "outer edges" of the evolutionary range farthest from the Center. Within this continuous spectrum, it is convenient to identify the three major divisions of vibratory frequency.
At the outer extremity of the range farthest from the Thought-Center is the dense Physical Realm which is our present Earth level. Moving in towards the Center we find the next major vibration level, less dense and more tenuous in the spacing of its atoms; this is the Etheric Realm (also known as the mental level), on which most of our neighboring planets in our solar system reside. Nearest to the Central Godhead of Pure Thought we find the Higher Spiritual Realms of Light, which are home to the Ascended Masters and Angelic Beings.
Within these three broad density levels of physical, etheric and spiritual, occult science identifies seven subdivisions, or intermediate levels. It is also explained that while our conscious earthly experience manifests at the densest level, all of the different densities co-exist and find expression in our bodies and the world around us.