Book excerpt: The Interior Urbanism Theory Reader expands our understanding of urbanism, interiority, and publicness from a global perspective across time and cultures. From ancient origins to speculative futures, this book explores the rich complexities of interior urbanism as an interstitial socio-spatial condition. Employing an interdisciplinary lens, it examines the intersectional characteristics that define interior urbanism. Fifty chapters investigate the topic in relation to architecture, planning, urban design, interior architecture, interior design, archaeology, engineering, sociology, psychology, and geography. Individual essays reveal the historical, typological, and morphological origins of interior urbanism, as well as its diverse scales, occupancies, and atmospheres. The Interior Urbanism Theory Reader will appeal to scholars, practitioners, students, and enthusiasts of urbanism, architecture, planning, interiors, and the social sciences.