This book brings together a number of prominent scholars to explore a relatively under-studied area of Marshall McLuhan’s thought: his idea of formal cause and the role that formal cause plays in the emergence of new technologies and in structuring societal relations. Aiming to open a new way of understanding McLuhan’s thought in this area, and to provide methodological grounding for future media ecology research, the book runs the gamut, from contributions that directly support McLuhan’s arguments to those that see in them the germs of future developments in emergent dynamics and complexity theory.