We have many ways to connect 0our resources to our goals, and each of these ways has its own criteria for identifying essential parts. In fact, we might employ several of these approaches simultaneously when solving problems.
"The quality of our understanding depends upon how well we move between those different realms. In order to translate easily from one of them to another, we must discover systematic cross-realm correspondences. However, finding these is rare. ... What is remarkable about hte body-support concept is how often it leads to systematic cross-realm correspondences." Cross-realm translations are the roots of fruitful metaphors.
(NB: For many, many examples of things that might count as being as fruitful as body-support, see Lakoff and Johnson's book "Metaphors we live by">)
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