Donald’s fundamental idea is that the evolution of consciousness has gone through a number of stages, which he calls episodic, mimetic, mythic, and theoretic. Episodic consciousness, characterized by episodic event perceptions and self-awareness (the primitive kind, such as recognizing oneself in the mirror), was attained by the primates, as is currently observable in some apes today. The mimetic stage was achieved by early hominids (2 million years to 0.4 million years ago), e.g., homo erectus, who evolved to have the skills of action metaphor, gesture, mime, and imitation. The mythic stage was achieved by homo sapiens and peaked in our subspecies, homo sapiens sapiens (0.5 million years ago to the present), who developed language, symbolic representation, oral traditions, and narrative thought. The theoretic stage represents modern culture with its external symbolic universe, formalisms, and, above all, massive external storage of information.