The Giver by Lois Lowry has long been one of my all-time favorite books.
It's about a society that is entirely different from anything we know. The main character is aboy named Jonas, and in his society there is no color. For Jonas's friends, family, and fellow community members, there is no music, no emotion, no difference.
The society is one founded on Sameness. Nothing is overly distinguishable from anything else. There's not even any weather.
This Sameness is achieved through the storage of all the memories of the past in one person: the Receiver.
The Giver is about the things that would have to be sacrificed for perfect peace and similarity and also about what happens to people when emotions are removed. It was a very good book, having more insight and truth in only 192 pages than many people have encountered in all the books they've ever read.