This is based on the concept that there is a physical plane or “world” and a non-physical or astral world. It is in this non-physical world where magickal practices have their initial effect. Later, this manifests on the physical plane. As physical beings we exist in the physical world. When performing magickal rites it is common to first create a circle or magickal space. This space is neither wholly in the physical or non-physical worlds, but “between” both. Thus, when sacred space is created for magickal or spiritual practices, it is said to be “between the worlds.”