This book examines semiotics, meaning-making and the co-construction of relations in transmodal communications. Through the lens of transpositioning - the multiple and interwoven layers of emplacements and positionings that are entailed in communications which cross and transcend the boundaries that have historically shaped our thinking about the world and its inhabitants - the chapters interrogate digital languaging and literacies, and how transmodal communications shape identities, belongings and relationships, with particular attention paid to issues of equity and social justice. The chapter authors consider both transmodalities and critical cosmopolitanism as they analyze empirical data from youth, adults and researchers participating in a project that digitally connects youth to share their lives across diverse and under-resourced global communities. In offering this multi-perspectival, multi-voiced volume, the authors portray and address methodological issues in researching transglobal transmodal communications.