The term involution has various meanings. In some instances it refers to a process prior to evolution which gives rise to the cosmos, in others it is an aspect of evolution, and in still others it is a process that follows the completion of evolution in the human form. According to esoteric cosmology In theosophy, anthroposophy and Rosicrucianism, involution and evolution are part of a complex sequence of cosmic cycles, called Round. When the universe attains a stage of sufficient density, the individual spirit is able to descend and participate in the evolution. Involution thus refers to the incarnation of spirit in an already established matter, the necessary prerequisite of evolution: That period of time devoted to the attainment of self-consciousness and the building of the vehicles through which the spirit in man manifests, is called involution. Its purpose is to slowly carry life lower and deeper into denser and denser matter for the building of forms, till the nadir of materiality is reached. From that point, life begins to ascend into higher Worlds. This succeeding period of existence, during which the individual human being develops self-consciousness into divine omniscience, is called "spiritual evolution". In the cosmology of Surat Shabda Yoga, involution and evolution apply to both the macrocosm, the whole of creation, and the microcosm, the constitution of an individual soul. The Rosicrucian Cosmo-Conception, a Rosicrucian text written by Max Heindel, advances the concept of epigenesis as the key related to the evolution (after an involutionary period) of human beings. According to Sri Aurobindo Introduction For Sri Aurobindo, involution is the process by which the Omnipresent Reality, i.e. the Absolute, Brahman extends Itself to create a universe of separate forms from out of Its own Force/Energy. Sat, Chit-Tapas, and Delight/Ananda are the three aspects of Satchitananda, and they are part of involution. Spirit or consciousness manifests as these three, and then as the intermediate link of Supermind, which is transitional between the higher and lower (matter, life, and mind) nature. The reason for involution is Delight—the Delight of Being (the Spirit or Absolute) moving to Delight of Becoming (temporal existence, the cosmos). Being throws itself forward into a multiplicity of forms, becoming lost in the inconscience of matter, and then through evolution it partakes in the Delight of rediscovering the Spirit which had been hidden in the interim. Evolution is thus the movement forward by which the created universe