Kwame Anthony Appiah is a writer and thinker of remarkable range. He began his academic career as an analytic philosopher of language, but soon branched out to become one of the most prominent and respected philosophical voices addressing a wide public on topics of moral and political importance such as race, cosmopolitanism, multiculturalism, codes of honor, and moral psychology. Two years ago he even took on the “Ethicist” column in The New York Times Magazine, and it is easy to become addicted to his incisive answers to the extraordinary variety of real-life moral questions posed by readers. Appiah’s latest book, As If: Idealization and Ideals, is in part a return to his earlier, more abstract and technical interests.