Medieval technology could raise marvels of architecture 200 feet in the air, it could conceive the mechanics of a loom capable of weaving patterned cloth, and of a gearshaft capable of harnessing the insubstantial air to turn a heavy millstone, but it failed to conceive the fore-and-aft rig and swinging boom capable of adapting sails to the direction of the wind. By such accident of the human mind, war, trade, and history are shaped.
( Barbara W. Tuchman )
[ A Distant Mirror: The ]
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