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Here is one thing that the masons building the cathedral and the scholars occupying its chapels would have agreed on: that the stones out of which it is constructed are heavy, and that there is nothing one can do about it. We can, of course, accommodate this heaviness. The scholars may try to understand why stones are heavy and what heaviness is; the masons may try to tackle it “with winch and pulley.” But both would agree that some things in the world are light and some are heavy, and no knowledge can change that.
The cathedral metaphor suggested an important distinction: between what its builders knew how to do – in order to erect the cathedral – and what they knew about the world – according to which they attempted to shape the cathedral. Going back in time, searching for the resources they drew on, we have also revealed the limits of the distinction: knowledge about the world, it turns out, is itself a kind of know-how. Both types of knowledge require skills, tools, materials; they involve recognizing problems and seeking solutions; searching for resources, adopting and adapting them to new use.