Cathedral dome , a vast octagonal structure crowned by an enormous lantern designed by Brunelleschi alone . His solution was to create a dome within a dome , which would further support the exterior weight effectively while removing the need for interior armatures or any other superfluous accessories that would distract from the simplicity of the construction . The outer dome was thus constructed as a light skin or cover , exhibiting great visual authority over the Florence skyline . The use of ``spiraling courses of...
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