A cosmotheological diagram drawn by Sri Aurobindo (and asosciated commentaries) in 1926 or 1927 has a three-fold creation. In this, between the Eternal and Temporal Manifestations is The Manifestation in Eternal Time, which corresponds to the Plane of Supermind, although it involves additional elements not described in The Life Divine or elsewhere
This is the third part of the series. The first diagram (as well as the first part of this diagram) pertains to the Unmanifest Absolute, the second to the planes of infinite Sachchidananda (here Satya Loka replaces the plane of Sat), and the third to the Supermind in its own realm.
Note near the bottom of the diagram the perfected Truth-Mind, Truth-Life, and Truth-Form, which perhaps exist as perfect potentialities or archetypes within the Supermind, waiting to be actualised through the supramentalisation and divinisation of the physical cosmos. These Realities may well exist now, but are just waiting (according to our thinking, which is time-bound - in the absolute there is no "waiting") to be actualised physically.
It is not clear if Sri Aurobindo intended this as part of his official teaching or if - more likely- it was just something he scrawled, on the basis of inspirations, but not codified as a complete philosophy.
Nevertheless, the similarities with other wisdom traditions like the Gnostic Pleroma, Neoplatonic Noetic Cosmos, Lurianic "Adam Kadmon", and Sant Mat system of transcendent planes, shows that the idea of a transcendent, perfect, divine world is an old one.
In the following diagram, we see the Iamblichan-Procline concept of "lower" (relative to the Supreme!, from our perspective they are still infinite beyond infinite, perfect beyond perfect, blissfull beyond blissful...) cosmic-divine hypostases that participate in the supreme infinitude from above. Hence Vijnaneshwara - Vijnaneshwari represent an emanation of the Parameshwara-Parameshwari of the Supreme Absolute and Eternal Manifestation
The lokas also correspond to an emanation of the original hypostases of Sat, Chit, and Ananda of the Eternal Manifestation. "Vijnana loka" is theSupermind proper - in Sri Aurobindo's reading of the Taittiriya Upanishad vijnana is not intuitive or inner mind as it is in the conventional vedantic (especially advaitin) interpretation in terms of koshas, but the Supramental purusha which is still be actualised, and will be as part of the process of Supramentalisation
The Manifestation in Eternal Time
Satyam Ritam Brihat
ADITI - M [the Mother]
[VIJNANESHWARA - VIJNANESHWARI]
The Thrice Seven Supreme
Planes of the Mother
TRUTH-FORM IN PERPETUAL SUBSTANCE
The Temporal Manifestation
"Seven times seven are the planes of the Supreme Goddess, the steps of ascent and descent of the Divine Transcendent and Universal Adya-shakti.
Above are the thrice seven supreme planes of Sat-Chit-Ananda; in between are the seven planes of the Divine Truth and Vastness, Mahad Brahma; below are the thrice seven steps of the ascent and descent into this evolutionary world of the earth-existence.
These three gradations are successively Supermind or Truth-Mind, with its seven Suns; Life with its seven Lotuses; Earth with its seven Jewel-Centres.
The seven Lotuses are the seven cakras of the Tantric tradition, descending and ascending from Mind (Sahasradala, Ajna, Visuddha, Anahata) that take up Life through Life in Force (Manipura, Swadhisthana) down to Life involved in Matter (Muladhara).
All these Life-Centres are in themselves centres of Truth in Life even as the seven Suns are each a flaming heart of Truth in luminous Divine-Mind-Existence; but these lotuses have been veiled, closed, shut into their own occult energies by the Ignorance. Hence the obscurity, falsehood, death, suffering of our existence.
The Jewel-Centres of the Earth Mother are seven luminous jewel-hearts of Truth in Substance; but they have been imprisoned in darkness, fossilised in immobility, veiled, closed, shut into their own occult energies by the hardness, darkness and inertia of the material Inconscience.
To liberate all these powers by the luminous and flaming descent of the Suns of the Supermind and the release of the eighth Sun of Truth hidden in the Earth, in the darkness of the Inconscience, in the cavern of Vala and his Panis, this is the first step towards the restoration of the Earth Mother to her own divinity and the earth-existence to its native light, truth, life and bliss of immaculate Ananda."
Here seven is mentioned because that is the number of planes in the overall cosmology; here each is divided in turn into seven, as in Theosophy (this seven times seven division is not found elesewhere in Sri Aurobindo's teaching. But these planes also correspond to the Divine Reality, as opposed to the temporal manifestation; compare this with the seven attributes of Theon's "Etherisms" hypostasis.
Significantly the three "lower" gradations are Supermind/Truth-Mind, Life, and Earth, rather than the usual Mind, Life and Matter. So it is a divinised or perfect Mind that is being referred to here - in fact the whole diagram refers to a perfected or Ideal Divine Creation, as distinct from "The Temporal Manifestation" which is the conventional planes of Mind, Life and Matter