When the Human Complementation Plan starts, EVA-01 grows into something like a tree, with its roots spreaded towards the sky and its branches extended to the ground.
Regarding this Fuyutsuki comments, "EVA-01 is returned to the Tree of Life".
A Tree of Life that has its roots and branches inverted appears on both Hindu scriptures and the Kabbalah. This was called "the Inverted Tree"