The 'Trinity'

   'Purusha', 'mahat/ (prakruti) and 'kaala' are the three (trinity) from which the universe finds its expression. Be it a star or galaxy, or may it be the sun and its family of planets and satellites, or the land and water supporting all living beings, all are manifests forms of one supreme power that manifests as the 'trinity'." Like water or clay, this prakruti is the material cause (nimitta karana) and purusha is the unchanging category that contributes to the causal operation (upadana karana) merely by its contiguity." (Ahir. Sam.)  

   "With the evolution of the 'mahat' the manus descend into it. From the mahat and in the mahat there spring the senses by which the objects are perceived as existent or non-existent." (ibid,)

   "Again from and in the mahat there springs the ahankara (ego) through the influence of the spiritual energy of God." (ibid VII 15). The ahankara is also called by the names of abhimana, prajapati, abhimantaa and boddha. The ahankara is of three kinds- vaikarika ((predominant sattva), taijasa (predominance of rajas), and bhutadi (gross elements, predominance of tamas). The ahankara manifests itself as will, anger, greed, mind (manas) and desire (Trisha)." (ibid,)

   "From ahankara then there is produced the organ of thinking (chintanatmaka indriyam) of the 'manus' called the  'manas' It is at this stage the manus become first the thinking entities (manavas) "

   "From the tamas side of the ahankara as bhutadis there is produced the Shabda (sound) tanmatra) from which the akasha (space/sky) is produced." Thus Mind and sound is the source of space! "Akasha is associated with the quality of shabda (sound) and gives room for all things." In fact, Light and sound travel through space to manifest in different forms all entities!

   "Akasha is thus regarded as unoccupied space, which is supposed to be associated with the quality of sound. With the emergence of the akasha manus (and manas) descend into it"
   The manus are Saavarni, Dharma-saavarni, Daksha-saavarni and Saavarna. These manus come along with the seven Rishis like Bhrugu and  others. 

  Similarly, from vaikarika ahankara emerges organs of hearing and speech. The manus at this stage associate with these. From bhutadi emerge the vayu (air) and the touch potential (sparsha tanmatra) and the manus descend into it."Light-heat potential is produced by the bhutadi and by the spiritual essence of God emerge all the sense organs to experience the tanmatras. Speech and hearing is thus associated with the vayu and fire tanmatra. 
  "When all the category of the ten senses are developed,there are produced the function of imagination, energy of will or samrambha, the five pranas such as apana, udana, vyana, samana and the prana, from manas, buddhi, and ahankara, and through their development are produced all the elements that may cooperate together to form the concrete personality." (Ahir. Sam., VII 42-43)
  Dissolution also takes place in the reverse order! 
   This is how the jivas take shape and the humans are working from birth to death depending on Nature, prakruti. [See Surendranath Dasgupta's A History of Indian Philosophy, pp. 45-50] 
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