Emerald City Syndrome

In L. Frank Baum's The Wonderful Wizard of Oz (the book, not the movie), Dorothy and her friends reach the Emerald City, and on the outside it's the most brilliant emerald green (exactly what you'd expect right?). Anyways they get inside and are given these green sun-type glasses. They are told they must wear them because the light reflecting off the walls is too brilliant and they must protect their eyes. They go through that whole bit with getting new green clothes to look nice for the Wizard and all of that jazz that happens there. When they leave the city to go on their quest to kill the witch they take off their green glasses and realize that their clothes aren't green like they thought, but white.
Are you ready for the Shakespearean and anthropological tie ins yet?
People will see what they want to see. It's a simple truth that is found everywhere in the world. As natives of a specific place you see things how you're expected to see them, but if you go to another culture and meet the natives of that area, they may (and probably will) see the same things in a completely different way. It's easy to think that the other culture is wrong and that your way of seeing something is right, if you don't have the right anthropological attitude.
In "The Winter's Tale" Leontes is determined that what he sees is an unfaithful hussy of a wife. He has on his green glasses and is convinced that no matter who says differently, Hermione is green (a cheating whore), not white (a pure and honest wife). It's not until his wife and son die that he realizes, "Oh wait, these glasses are tinted."