The span is the material, not the leap
A belief I have held for years: a person should not stay inside one field, and the size of the gap between the fields they hold is the variable that matters. Two adjacent technical disciplines make somebody more useful. A technical discipline and a literary one seem to do something different in kind — the residues interact rather than stack.
I went looking for the theory behind that this week, and found it agreeing with half of what I thought. Koestler's bisociation is the same claim stated better and forty years earlier: an idea arrives when two internally consistent frames that are not habitually connected get held against each other. The wider the frames sit apart, the less anybody else has already stood in that spot.
The other half took a hit. Transfer research has been stubborn for a century — near transfer happens, far transfer is rare. Gentner's work on analogy explains why it stings: the value of an analogy comes from structural similarity between two situations, but what makes a person retrieve one from memory is surface similarity. The distant analogy, the one worth the most, is the one least likely to show up when it is needed.
So the leap is not automatic, and I had been treating it as though it were. Range supplies the material and not the mapping, and the mapping is a habit rather than a possession: stopping on a problem long enough to ask what else it resembles. A wide span raises the ceiling on what a person can connect. It does nothing on its own for the floor.
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