This biological reflection of cultural reflexivity blurs the Cartesian boundary between organism and environment. This duality is weakened further by Edelman's theory of brain development. His selectional accounts suggests that rather than a genetic blueprint, the brain's structure is due to the assimilation of the environment . However the human environment is human artefact. Thus, as the environment that creates the mind is created by the mind, a semiotic cycle is established.
Human meaning reflects signs in the environment.
These signs, to close the cycle, have been created by the human capacity to make meaning. The impulse of technology accelerates the semiotic cycle of cultural evolution and, snowball like, creates a dual accumulation. Within the environment has appeared a technological envelop of tools, buildings and machines. Within human consciousness have appeared the skills, practices and concepts that are their psychological complement. These internal resources allow people to inhabit the external envelop and to learn what it affords as a field for human action.