(Al Hadarat). These are the five universal planes, levels of existence or finding, or worlds of Entified Being. 1. The World of the Essence (dhat), The World of the Absolute Non-manifestation (al ghayb al mutlaq), or the Mystery of Mysteries (ghayb al ghayb). 2. The World of the Spirits which includes the First Intellect. 3. The Central World which is the Perfect Man himself, who is the isthmus between the two higher Worlds (i.e. the Essence and the Spirits) and the two lower Worlds (i.e. the Corporeal Bodies and the Imagination). 4. The World of similitude and Imagination. 5. The World of Corporeal Bodies, which is the plane of the senses and sensible experience. Man travels through these Five Presences as he descends from inward non-manifestation within Allah's Knowledge to outward manifestation within the world, and his Journey of Return (mi'raj) is an ascent back through these Five Presences.
(Khayal). Imagination indicates a reality that becomes manifest in three different places. Firstly, the Khayal is manifest within the cosmos where existence is the same as imagination. Secondly, the Khayal is manifest within the macrocosm where the isthmus between the spiritual and corporeal worlds is imaginal. Thirdly, the khayal is manifest within the microcosm where the human self is the reality between the body and the spirit. Khayal is synonymous with images. The Realm of Imagination is the isthmus between the World of the Unseen and the Visible World and it is within this khayal that man is given the clearest expression of the 'He, not He' (Huwa, la Huwa) mystery of existence. The human faculty of imagination (khayal) is purely passive with regard to the active conjectural faculty of illusion and with regard to the Spirit which may imprint upon it heralding visions.
(Barzakh). Barrier or isthmus or separating partition. The barzakh is the symbol of an intermediate state. It is something which separates two other things while never going to one side. It is the barrier between the known and the unknown, the existent and the non-existent. Imagination is the most excellent barzakh in that it is 'neither this nor that', or 'both this and that', or the realm of 'He/not He' (Huwa/la Huwa).
"It is He Who has let free the two bodies of flowing water: One palatable and sweet, and the other salt and bitter; yet has He made a barrier between them, a partition that is forbidden to be passed" (25:53) .