How did Filippo Brunelleschi construct his dome without temporary wooden scaffolding?

Filippo Brunelleschi constructed the dome of the Florence Cathedral using a revolutionary technique that involved a double-shell design, which allowed for greater stability and reduced the need for scaffolding. He employed a herringbone pattern for the brickwork, which helped distribute weight evenly and prevented the structure from collapsing during construction. Additionally, he developed a unique system of hoisting and tensioning that enabled the stones to be placed accurately without the need for extensive scaffolding. This innovative approach allowed him to complete the dome successfully and efficiently.