It begins by explaining how the rivalry between Filippo and Lorenzo had been going on for years, and Filippo had quickly become the best designer of the dome. Unfortunately for Filippo, Lorenzo has the same salary and could possibly share the credit with Filippo. In 1423, when Filippo's project was chosen, disaster seemed to strike; Filippo goes to bed, apparently very ill. When it seems he won't recover, Lorenzo is forced to take on this project again. After Lorenzo puts the men back to work, Filippo miraculously recovers. He returns to the construction site, denounces Lorenzo's incompetence and is rewarded with a salary almost triple the initial amount. This shows how selfish and self-centered Filippo truly is, as well as how easily he can get others to go along with his plans. Not only is he good at trickery, but he seems to enjoy the fear he inflicts on others. Ironically, Filippo is also very concerned about worker safety. He built a parapetto, or balcony, to calm the masons up high, and implemented other safety measures, such as leather harnesses and diluted wine. These safety measures worked as only three men died during the construction of the dome. Also natural at the time, Filippo must deal with unemployment, which leads to labor disputes and strikes. Filippo does not tolerate this behavior and, although he rehires the strikers, he pays them lower wages. Unlike today's strikes, there was no union to support workers during this earlier period.