The concept of the Multiverse is false. The Universe is one, Souls are unique, as well as Mind. It is impossible to copy Soul and any other object of Being with homogeneous composition, because it must be different, so two completely identical things are not allowed in Nature. The world is one and it is expressed through absolute uniqueness in all already created manifestations that cannot be duplicated. However, the Universe is infinite, it is in perpetual motion, and its objects Vibrating. Without motion and Vibration nothing would exist.
But the Astral is Multi-dimensional, has many Dimensions and time currents, it is not the same place. Many spaces, many times. The Physical World that we observe and touch is one of the Dimensions. Human is a Being existing on different Planes of Being, because the Human Soul has so many aspects and levels of Dimensions.
On the Astral there are those Dimensions that are Higher, with High Vibrations, and those Dimensions that are Lower, with Low Vibrations. All the Dimensions permeate all the Layers of Being and are intertwined with each other, but nevertheless have certain conditions for a full-fledged stay in them. The more developed the Soul is, the more it is able to stay in the Higher Dimensions, and even to fix itself permanently, transforming so as to stay there always. The conditions of being in the Higher Dimensions are incommensurably more Powerful than in the Lower Dimensions. These are the Spheres of Being.
All these Dimensions have a purpose, its Higher Meaning, its Higher Will. Understanding the Intent and Power of a Dimension allows one to become likened to it and exist in the Dimension. Being in a Dimension changes the Soul, so the Being becomes a conduit of the Force.