The book explores how to construct original languages and design realistic social structures, including governance, economics, religion, and cultural norms. It emphasizes the importance of internal rules, ensuring that magic systems and societal advancements operate predictably. Fantasy Structures begins by introducing core concepts, progressing to linguistic creation, and then focusing on societal models. Case studies and practical exercises demonstrate the application of these concepts, drawing upon historical linguistics, anthropology, comparative mythology, and political science to build a robust foundation for world-building.