We are a function of two brains: a left brain and a right. Both sides work together to create a unity of one.
One side is usually more dominant than the other. For some people, they think in words rather than patterns — they are more analytical than visual. Others can be more right-minded, perceptive rather than too sober.
The left brain edits the right. The right brain loosens up the left. One side tells you to conform; the other side to rage into your art.
Both brain hemispheres work together in a system of checks and balances. In such a way, we are two selves in one.