Buttons are an important symbol throughout the novel. In the other world, people have buttons in place of their eyes. They act almost as masks, as they conceal the true identities of the individuals in the other world. As the popular adage explains, "eyes are the windows to the soul." Because the buttons cover the eyes of each character in the other world, it is impossible for Coraline to determine each person's moral intentions. The protagonist is unable to gauge their human emotion through the plastic eyes. Coraline is explicitly told that in order to stay in the other world forever, she would need to forgo her eyes and instead replace them with buttons. This would indicate that Coraline would have to sacrifice her soul in order to exist in the beldam's world.