Humanity exists in an ongoing state of evolution:
First, we actively integrate the newly added-on tissue of our left thinking brain (Character 1) with the tissue of the underlying left emotional brain tissue (Character 2), and then we are integrating the new tissue in our right thinking brain with the brain tissue in between (Character 3 and 4).
Finally, we will evolve into whole-brain living, and consciously direct our own development as part of that evolution.