![]() Inside the Dome of the Duomo81 / 181 | Building the dome was a feat of engineering, partly because Florence
did not like external supports like flying buttresses, and partly because it is
octagonal. A circular dome would be much easier. Brunelleschi used brick for
the interior dome, because it weighed less than stone. The machines that he
made were so interesting that Leonardo da Vinci made sketches of them.
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