Verse 15

15. From This spring up prana vital breath,  mind,  all the organs,  sky,  air,  fire,  water and the earth that supports all.

"From This spring up prana vital breath,  mind,  all the organs"

The whole of this phenomenal universe is a transient projection ("From This spring up")  of material  ("breath mind and organs")   forming the body through which to experience worldly knowledge.
Breath,  Mind and organs describe the creation of the sentient form of the first born or reborn man.
"sky,  air,  fire,  water and the earth that supports all"
Correspondingly sky,  air,  fire and so forth describe this created world that supports the reborn man.

"This" refers to This Solitary jiva or this Solitary Existence or this Solitary indivisible Absolute Consciousness of Knowledge,  they are One Alone and the same.
"From This"  that has desire,  springs up the form of the body and the form of the universe to provide the experience in consciousness of obtaining and experiencing that desire. 

As described in the previous verse,  the Solitary experience of the states of life,  death and rebirth are caused and maintained by desire. 
When this Solitary jiva,  this Solitary self,  Realises the reality of Absolute Self which naturally leads to the falling away of worldly desires this jiva will reawaken into the Truth and Bliss of Absolute Consciousness Alone.