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The foolish and the wise The use of the word ‘folly’ in my previous post set some readers scratching their heads. What is a folly, exactly? That’s a good question, and one that has had many people stumped. A folly is a building without a practical purpose, some say. But what do we call a practical purpose? A house has a practical purpose, so does a mill, so does a garden shelter that protects people from a sudden shower of rain. But can an ornamental arch have a practical purpose – if it can also be a shelter, for example? And is a purely ornamental role enough for us to pigeonhole it as a folly? If the word ‘folly’ implies foolishness of some sort, we’re on difficult ground straight away: ‘where is the line drawn between foolishness and good sense?’ asks Stuart Barton.* Where indeed? In what is perhaps the best book on follies, Gwyn Headley and Wim Meulenkamp look at it another way. ‘A folly is a misunderstood building,’ they say.† Why would anyone build a tower on a hill, or constr...