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Bob Duggan considers Denis McNamara’s How to Read Churches:

Writing about geometric ornamentation, McNamara explains that “[m]athematics and geometry were understood as ways to return order and right proportions to the chaos of a fallen world.” ... I’ve seen photos of Russian onion domes countless times, but knowing that they mimic the burning flames of candles and usually appear in fives (one for Jesus Christ and four for the Four Evangelists) made me see them with fresh eyes.

(Photo of the Kremlin by Flickr user dipthongasaurus rex)