The extended mind thesis (EMT) says that an agent's mind and associated cognitive processing are neither skull-bound nor even body-bound, but extend into the agent's world. As Clark and Chalmers see it: Where does the mind stop and the rest of the world begin?...We propose to pursue... an active externalism, based on the active role of the environment in driving cognitive processes.— Andy Clark and David Chalmers: "The Extended Mind"