Spoken words, writing, and images originate in social and cultural contexts and so are fraught with meanings, are vehicles of values and norms. They inevitably also demarcate boundaries, serving to class people as members of groups or outsiders. This adds to the urgency of the question of what can in fact be said and shown, and who or what determines those limits. The present catalog addresses these concerns through a survey of eminent art of the twentieth and twenty-first centuries. The works gathered in it speak to mechanisms of inclusion and exclusion, to categorizations and the narratives that were created to sustain them. And they remind us that these phenomena are human-made, which is also to say, susceptible to change-that we share responsibility for them.