The Neo-theosophical concept of Causal Plane proved very influential both in India (via the Adyar branch of Theosophy) and in the New Age, via Alice Bailey.
About this latter he says The causal plane is the world of light and blessedness, the highest of heavenly regions, extolled in the scriptures of all faiths.
The causal plane is the abode of Lord Siva and His entourage of Mahadevas and other highly evolved souls who exist in their own self-effulgent form—radiant bodies of centillions of quantum light particles.He further says that this region, present as the clear white light that illumines the mind, can be accessed through the three higher chakras, the vishuddha, ajna and sahasrara[1] Although Neo-theosophy presents the sequence Physical-Astral-Mental-Causal, in the jargon of some astral travelling teachings, the causal plane is the one just above the astral plane.
According to the Astral Voyage website (see glossary) this is the region where memories and karmic patterns are stored, and where a practitioner can access information regarding the past and future.
The complex metaphysics of the Channelled entity Michael includes a description of the universe in terms of seven planes.