Contrary to our metaphors, humans are much more imitative than the other apes. For example: if chimps watch a demonstration on how to get food out of a puzzle box, they, in their turn, skip any unnecessary steps, go straight to the treat. Human children overimitate, reproducing each step regardless of its necessity. There is some reason why, now that it's our behavior, being slavishly imitative is superior to being thoughtful and efficient, but I forget exactly what that reason is.