The document discusses balancing a library collection using a "prism" model with two continuums: personal-invented and real-smiley face. It proposes a 2x2 matrix with these continuums to map different types of resources. Examples are given of resources like folklore, literature, and children's books that could fit in each quadrant. The model is suggested as a way to evaluate a collection's balance, especially on controversial issues, by mapping resources on both sides of an issue.