Bhagavad Gita 15.1 describes the material world to be a reflection of spiritual world. What is the axis of separation? Is that or consciousness. Here is what Srila Prabhupada says in the purport of that verse.
Now, there is no ready experience in this world of a tree situated with its branches down and its roots upward, but there is such a thing. That tree can be found beside a reservoir of water. We can see that the trees on the bank reflect upon the water with their branches down and roots up. In other words, the tree of this material world is only a reflection of the real tree of the spiritual world. This reflection of the spiritual world is situated on desire, just as a tree's reflection is situated on water. Desire is the cause of things' being situated in this reflected material light. One who wants to get out of this material existence must know this tree thoroughly through analytical study. Then he can cut off his relationship with it.
So its the desire and consciousness.
Posted by SAURABH. Edited by LNDASA.