Renaissance art
In 1401, a competition was held to find a sculptor to make a huge set of bronze door for the oldest church in Florence. Lorenzo Ghiberti, Filippo Brunelleschi and Donatello all entered the competition. Ghiberti won. When he finished the first set of doors, he had to make another set. It took fifty years. In that time, dozens of artists helped Ghiberti to make the doors.