Mueller explores three different aspects of humanity 's shared evolutionary timeline. In the beginning we all started out as animals, evolving from one species to another. A time when “the bones on our arms were shaped like zithers”, a time “before we had lungs” (Mueller 8-11). In this section Mueller connects to the ideas of instinct, and unconscious thought processes. According to her, “our children believe they can fly” because of our retain memories of flying and soaring through the sky. However, as evolution, and our biology progressed, we lost those animal traits “and learned to speak” (6-16). The second stage to Mueller’s model can be termed the historical generation, as it seems to span a time frame from early caveman to ancient civilizations