Pluralistic ignorance is defined on the website Changing Minds as something that "occurs where the majority of individuals in a group assume that most of their others are different in some way, whilst the truth is that they are more similar than they realize. They thus will conform with supposed norms. When most people do this, the supposed norm becomes the norm."
Literature and other art forms can be important tools that individuals can use to address pluralistic ignorance within society. People often are afraid to go against social norms because they fear being ostracized, or maybe they just don't even question it. Literature and art can be used to encourage people to think for themselves to feel more comfortable expressing their dissenting opinions because they know they aren't alone. This can be a catalyst for change within society.
Here is a kind of annoying youtube video explaining pluralistic ignorance.