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1420
Florence Cathdral´s dome
In 1380 the base was completed but no project was solid enough so they made 12 models and 2 were finalists, that of Filippo Brunelleschi and that of Lorenzo Ghiberti. and they chose Ghiberty's. But they decided that the two of them were going to work together. Previous attempts to raise the domethe first attempts did not work, so they used a method that consits of placing some flat bricks horizontally and others vertically, tracing a diagonal. The construction work on the dome lasted 16 years.