Book excerpt: Monolingualism-the idea that having just one language is the norm is only a recent invention, dating to late-eighteenth-century Europe. Yet it has become a dominant, if overlooked, structuring principle of modernity. According to this monolingual paradigm, individuals are imagined to be able to think and feel properly only in one language, while multiple languages are seen as a threat to the cohesion of individuals and communities, institutions and disciplines. As a result of this view, writing in anything but one's "mother tongue" has come to be seen as an aberration.