In part three, he focuses on how irrational stereotypes affect the way we learn things. “The most subtle and omnipresent influences are those that create and maintain the repertoire. of stereotypes. We are told about the world before we see it. We imagine most things before we experience them. And these preconceived ideas, unless education has made us fully aware of them, profoundly govern the entire process of perception. They distinguish certain objects as familiar or strange, emphasizing the difference, so that what is slightly familiar is perceived as very familiar, and what is somewhat strange as distinctly foreign. » (Lippmann