I’m not saying I fully understand it but it may prove of some usefulness to those still trying to work on Kryptos (and any other unsolved problems):

Heuristics

I always thought of it as studying how we learn and in a sense this is true.  It also relates to a type of problem-solving behavior.

It is not a possible solution for K4 but it is a tool that may be useful to know.

Knowing is half the battle.

Kryptosfan

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