Book excerpt: This book is a description of Luwo, a Western Nilotic language of South Sudan. Luwo is used by multilingual, dynamic communities of practice as one language among others that form individual and flexible repertoires. It is a language that serves as a means of expressing the Self, as a medium of art and self-actualization, and sometimes as a medium of writing. It is spoken in the home and in public spaces, by fairly large numbers of people who identify themselves as Luwo and as members of all kinds of other groups. In order to provide insights into these dynamic and diverse realities of Luwo, this book contains both a concise description and analysis of the linguistic features and structures of Luwo, and an approach to the anthropological linguistics of this language. The latter is presented in the form of separate chapters on possession, number, experiencer constructions, spatial orientation, perception and cognition. In all sections of this study, sociolinguistic information is provided wherever this is useful and possible, detailed information on the semantics of grammatical features and constructions is given, and discussions of theory-oriented approaches to various linguistic features of Luwo are presented.