A Plane is a large manifested reality. For the sake of instruction it is necessary to define two terms. The first, “Reality-Plane” refers to a Plane of existence with emphasis on the fact that it is a Reality. The second term, “Planar-Reality" refers to the environment created by a Reality-Plane. This environment includes physical laws and other foundations of existence.
It is helpful to think of a Reality-Plane as a container for a Planar-Reality. A Reality-Plane gives rise to a Planar-Reality by creating the physical laws and materials that make existence possible, such as: matter, energy, gravity, electro-magnetism, force, acceleration, mass, inertia, and so on. This means that a change in the Essence that affects the Reality-Plane will directly affect the Planar-Reality. The objects contained in a Planar-Reality are manifestations of the essence.
The difference between Planes depends upon their stability and their types of Planar-Realities. Many times Reality-Planes can intersect and give rise to other Reality-Planes with higher degrees of Strong Order. Some Planes can exist only as unions or intersections between different planes within a Nexus.
This is the kind of world and universe we know of as material. Physical planes are shaped and governed by the physical laws of the reality plane in which they reside. A Physical Plane has the greatest level of Order and stability but is a Reality that emerges only by an intersection of Ethereal and Spiritual Planes.
The Ethereal Plane arises from a combination of two or more Spiritual Planes with an increased amount of Mana and a higher order that emerges as a result. On the Ethereal Plane a type of Spiritual Matter emerges that envelops spiritual entities and Psyches, clothing them in Spiritual forms. It is here that the Soul manifests and can access Mana in preparation to being manifested in a corporeal form on a Physical Plane.
The Spiritual Plane is not manifested with materially as is the Physical and Ethereal Planes. Within the Spiritual Plane there is no true matter, only Psyche (the intelligent consciousness of an entity,) perceptions and emotions. It is in such a Plane that the identity, consciousness and personality of a Psyche can have a sensible manifestation. The lack of true matter means that an experience on a Spiritual Plane is shaped almost exclusively by the beliefs and perceptions of the consciousness’s of those residing on the Plane. Depending on the personality of each being, the Planar-Reality can be quite different. In fact, it is shaped dynamically by the intelligences that inhabit it.