Four Worlds
The Four Worlds ( "Olamot", singular: "Olam" עולם), sometimes counted with a prior stage to make Five Worlds, are the comprehensive categories of spiritual realms in Kabbalah in the descending chain of Existence. The concept of "Worlds" denotes the emanation of creative lifeforce from the Ein Sof Divine Infinite, through progressive, innumerable tzimtzumim (concealments/veilings/condensations). As particular sefirot dominate in each realm, so the primordial fifth World, Adam Kadmon, is often excluded for its transcendence, and the four subsequent Worlds are usually referred to. Their names are read out from Isaiah 43:7, "Every one that is called by  My name and for "My glory", I have "created", I have "formed", even I have "made"" each elucidating the names Atziluth ("Emanation/Close"), Beriah ("Creation"), Yetzirah ("Formation"), and Asiyah ("Action"). Below Asiyah, the lowest spiritual World, is "Asiyah-Gashmi" ("Physical Asiyah"), our Physical Universe, which enclothes its last two sefirot “emanations” (Yesod and Malkuth). Collectively, the Four Worlds are also referred to as ABiYA, after their initial letters. As well as the functional role each World has in the process of Creation, they also embody dimensions of consciousness within human experience. Enumeration. The Worlds are formed by the Ohr Mimalei  Kol Olmin, literally "Fills all Words", which is the Divine creative light that represents the concept of Divine immanence. The 10 sefirot attributes and their associated 12 partzufim "shine" in each world, as do more specific Divine manifestations. In Lurianic Kabbalah, the partzufim dynamically interact with each other, and sublime "levels" are enclothed within lower existences, representing a sort-of concealed soul. Nonetheless, in each World, particular sefirot and partzufim predominate. The Five Worlds are, in descending order: Meaning. The Four Worlds are spiritual, heavenly realms in a descending chain, although the lowest world of Assiah has both a spiritual  and a physical aspect. The physical level of Assiah is our physical finite realm, including the cosmological Universe studied by science. Consequently, as Kabbalah becomes more of a metaphysical study, the terms "higher" and "lower" are used as metaphors for being closer or further from Divine consciousness, revelation, and emanance. The 16th-century systemisation of Kabbalah by Moshe Cordovero brought the preceding interpretations and schools into their first complete rational synthesis. Subsequent doctrines of Kabbalah from Isaac Luria, describe an initial Tzimtzum (withdrawal of the universal Divine consciousness that preceded Creation) to "allow room" for created beings on lower levels  of consciousness. Lower levels of consciousness require the self-perception of independent existence, by the created beings on each level, to prevent their loss of identity before the magnificence of God. This illusion increases with more force in each subsequent descending realm. The number of graduations between the Infinite and the finite, is likewise infinite, and arises from innumerable, progressively strong concealments of the Divine light. Nonetheless, the four worlds represent fundamental categories of Divine consciousness from each other, which delineates their four descriptions. Consequently, each world also psychologically represents a spiritual rung of ascent in human consciousness, as it  approaches the Divine. Kabbalah distinguishes between two types of Divine light that emanate through the 10 sefirot (Divine emanations) from the Infinite (Ein Sof), to create or affect reality. There is a continual flow of a "lower" light, the "Mimalei Kol Olmin", the light of eminence that "fills all worlds" is the creating force in each descending world, that itself continually brings everything in that level of existence into being from nothing. It is this light that undergoes the various divine concealments and contractions as it descends downward to create the next level, and adapts itself to the capacity of  each created being on each level. A transcendent higher light "Sovev Kol Olmin", the light that "surrounds all worlds" would be the manifestation on a particular level of a higher light which above the capacity of that realm to contain. This is ultimately rooted in the infinite light ("Ohr Ein Sof") that preceded Creation, the Tzimtzum and the Sephirot, rather than the source of the immanent light in the "Kav" (first emanation of creation after the Tzimtzum), in the teachings of Isaac Luria. Consequently, all the worlds are dependent for their continual existence on the flow of Divinity they constantly  receive from the Divine Will to create them. Creation is continuous. The faculty of Divine Will is represented in the sefirot (10 Divine emanations) by the first, supra-conscious Sephirah of "Keter"-Crown, that transcends the lower 9 Sephirot of conscious intellect and emotion. Once the Divine Will is manifest, then it actualises Creation through Divine Intellect, and "subsequently" Divine Emotion, until it results in action. The reference to temporal cause and effect is itself a metaphor. The psychology of man also reflects the "Divine psychology" of the sefirot, as "Man is created in the image of God" (Genesis 1:27). In  man the activation of willpower through intellect and emotion until deed, requires time and subsequent cause and effect. In the Divine Sephirot and their activation of Creation, this does not apply, as limitations only apply to Creation. The Book of Job states that "from my flesh I see God". In Kabbalah and Hasidism this is understood to refer to the correspondence between the "Divine psychology" of the Four Worlds and the Sephirot, with human psychology and the Sephirot in the soul of man. From understanding the Kabbalistic description of the human soul, we can grasp the meaning of the Divine  scheme. Ultimately, this is seen as the reason that God chose to emanate His Divinity through the 10 Sephirot, and chose to create the corresponding chain of four Worlds (called the "Seder hishtalshelus"-"order of development"). He could have chosen to bridge the infinite gap between the Ein Sof and our World by a leap of Divine decree. Instead the Sephirot and Four Worlds allow man to understand Divinity through Divine manifestation, by understanding himself. The verse in Genesis of this correspondence also describes the feminine half of Creation: (Genesis 1:27) "So God created man in His own image, in the  image of God created He him, male and female created He them". Consequently, some of the sefirot are feminine, and the Shechina (immanent Divine presence) is seen as feminine. It is the intimate relationship between the Divine scheme of four World and man, that allows man's ascent more easily to Divine consciousness (see Dveikus).