My story is told from three primary character's points of view. None of them are perfect, they all have their own agendas, and one has a completely backwards view of the world. Through these points of view the readers learn about the world. My question is do I need to set a baseline? To what extent do I need to explain reality of the world? At somepoint in the story do I need to have some secondary character say "No, dummies, that house was brown." Or can I let it stay ambiguous?