Windows and mirrors is a phrase used in the children’s book world, and probably beyond… It’s a good answer to this kind of question: “Why should we have any books about black people in our library? We don’t have any black people using our library.” You can substitute any term you like for “black people.” Howsabout “lesbians” or “Holocaust victims” or “Native American people” or “foster families” or “trans people” or ?” Etc.
We needs books of all kinds in our life–those that reflect our world back to us (mirrors), and those that open us up to the worlds of others (windows).
That’s the essence of windows and mirrors, and I think it applies to life as well as books. We need to seek out people and experiences that reflect who we are PLUS people and experiences that open us up to the rest of the world.