Our knowledge, both explicit and inexplicit, is not only much greater than his but structurally different too. As I have said, the modern theories are fewer, more general and deeper. For each situation that the master builder faced while building something in his repertoire – say, when deciding how thick to make a load-bearing wall – he had a fairly specific intuition or rule of thumb, which, however, could give hopelessly wrong answers if applied to novel situations. Today one deduces such things from a theory that is general enough for it to be applied to walls made of any material, in all
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