" First, using images made from the oldest components of the organism’s interior—the processes of metabolic chemistry largely carried out in viscera and in the blood circulation and the movements they generated—nature gradually fashioned feelings. Second, using images from a less ancient component of the interior—the skeletal frame and the muscles attached to it—nature generated a representation of the encasement of each life, a literal representation of the house inhabited by each life. The eventual combination of these two sets of representations opened the way for consciousness. Third, using the same image-making devices and an inherent power of images—the power to stand for and symbolize something else—nature developed verbal languages. "

― António R. Damásio , The Strange Order of Things: Life, Feeling, and the Making of Cultures