Brunelleschi's Dome- How do the actions and decisions of people effect change?

I believe that taking risks most prompted Brunelleschi to succeed in constructing the dome. There were many risks he had to take along the way that he didn't know would work, but simply building the dome was a risk in and of itself. Nobody knew if Brunelleschi's design would work. Even he himself didn't know for sure, but he built the dome anyway. Many people would be afraid to construct something without knowing what the results would be, or whether the dome would topple over or not, but its the true geniuses who take risks with their artwork and architecture.