Progress to our current state of knowledge was not achieved by accumulating more theories of the same kind as the master builder knew. 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
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