Based on my own experiences our universe consists of three planes - the physical (the one our bodies and all the tangible reality exist in), the astral (a different plane of the soul, the emotions etc.) and the mental (where thoughts and abstract ideas dwell). By default, the average person only has access to the lowest, physical plane, having but limited consciousness of the other two. With some spiritual work and self-improvement however, all of us can potentially experience a dissociative episode and reach the upper echelons of reality.