consider to be polarities. Differentiation of the poles of a polarity into separateconcepts, then, would emerge after the underlying form of experience (thetraversing of terrain or the passage of time, or, simply, ongoingness of expe-rience of a cyclical nature) was noticed and exploited for some purpose, suchas safety or ease. For example, it is easier moving through the forest by day,and it is cooler moving through the desert at night. There was survival valuein distinguishing different aspects of unified experience.
for - key insight - language - emergence of polarity - evolutionary fitness