This book includes 14 contributions to the study of structuralism as a historical current in the history of European ideas, and more particularly in the study of language. The studies combine to contextualise structuralism in both its unity and its diversity, hence the title. In the first section, the reader is introduced to the broader canvas of disciplines and competing ideas surrounding structuralism, starting with Claude Lévi-Strauss's anthropological structuralism. The second section views structural linguistics from without and investigates its legacy in relation to contemporary linguistics, analysing its relationship to functionalism and its forerunners. The third section explores structuralism from within, with particular attention to a specific output: Louis Hjelmslev's theory of glossematics. This constitutes the focus from where the immediate past within the Danish tradition is reanalyzed and its heritage for today's semiotics and linguistics is discussed.