The semantic sphere Pierre Lévy ; 1: Computation cognition and information economy The new digital media offers us an unprecedented memory capacity an ubiquitous communication channel and a growing computing power. How can we exploit this medium to augment our personal and social cognitive processes at the service of human development Combining a deep knowledge of humanities and social sciences as well as a real familiarity with computer science issues this book explains the collaborative construction of a global hypercortex coordinated by a computable metalanguage. By recognizing fully the symbolic and social nature of human cognition we could transform our current opaque global brain into a reflexive collective intelligence