The global brain can be conceived most fundamentally as a higher level of evolution, the way humans form a higher level of organization that evolved out of the animals. Although the analogy between an organism and a society can be applied even to primitive societies, it becomes clearly more applicable as technology develops. As transport and communication become more efficient, different parts of global society become more interdependent. At the same time, the variety of ideas, specializations, and subcultures increases. This simultaneous integration and differentiation creates an increasingly coherent system, functioning at a much higher level of complexity.