When we consider the idea of a ‘world’ from our human standpoint, we tend to think of it as a physical place, like the earth, which exists somewhere in the physical universe. We consider visiting a world as being a movement through Space and Time. The Vedic conception of ‘worlds’ however is one of a state of consciousness rather than a physical location. This is an essential distinction when we try to understand the way the Vedic Rishis look at the process and methods of realisation. The Vedic conception was of seven worlds that are part of one continuum.
Sri Aurobindo explains: “All conscious being is one and indivisible in itself, but in manifestation it becomes a complex rhythm, a scale of harmonies, a hierarchy of states or movements. For what we call a state is only the organisation of a complex movement. This hierarchy is composed by a descending or involutive and an ascending or evolutive movement of which Spirit and Matter are the highest and lowest terms. Spirit is Sat or pure existence, pure in self-awareness (Chit), pure in self-delight (Ananda). Therefore Spirit can be regarded as a triune basis of all conscious being. There are three terms, but they are really one. For all pure existence is in its essence pure self-conscience and all pure self-conscience is in its essence pure self-delight.”
“An integral intuition into the nature of conscious being shows us that it is indeed one in essence, but also that it is capable of an infinite potential complexity and multiplicity in self-experience. The working of this potential complexity and multiplicity in the One is what we call from our point of view manifestation or creation or world or becoming. … Without it no world-existence is possible.”
“All organisation of self-conscient being which takes as its basis the unity of pure existence belongs to the world of the highest creation, … the worlds of the Spirit. We can conceive three principal formations. When tapas or energy of self-conscience dwells upon sat or pure existence as its basis, the result is satyaloka or world of true existence. The soul in satyaloka is one with all its manifestations by oneness of essence and therefore one in self-conscience and in energy of self-conscience and one also in bliss.”
Similarly, the focus may be upon the aspect of consciousness, or the aspect of creative Delight of existence. “All these are states of consciousness in which unity and multiplicity have not yet been separated from each other. All is in all, each in all and all in each, inherently, by the very nature of conscious being and without effort of conception or travail of perception.”
Sri Aurobindo, The Upanishads, Isha Upanishad and analysis, pg. 23, 28 & 74-83