If all abstract thought is metaphorical, and all metaphors are assembled out of biologically basic concepts, then we would have an explanation for the evolution of human intelligence. Human intelligence would be a product of metaphor and combinatorics. Metaphor allows the mind to use a few basic ideas-substance, location, force, goal-to understand more abstract domains. Combinatorics allows a finite set of simple ideas to give rise to an infinite set of complex ones.
-Steven Pinker
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