These new doors would serve as a votive offering to celebrate Florence being spared from relatively recent scourges such as the Black Death in 1348. Each participant was given four tables of brass, and was required to make a relief of the “Sacrifice of Isaac” on a piece of metal that was the size and shape of the door panels. Each artist was given a year to prepare their panel, and the artist who was judged the best was to be given the commission. While many artists competed for this commission the jury selected only seven semifinalists which included Ghiberti, Filippo Brunelleschi, Simone da Colle, Francesco di Val d’Ombrino, Niccolo d’ Arezzo, Jacopo della Quercia da Siena, and Niccolo Lamberti. In 1402 at the time of judging, only Ghiberti and Brunelleschi were finalists, and when the judges could not decide, they were assigned to work together on them. Brunelleschi's pride got in the way, and he went to Rome to study architecture, thereby leaving the then 21-year-old Ghiberti to work on the doors himself. Ghiberti's autobiography, however, claimed that he had won, "without a single dissenting voice." The original designs of "The Sacrifice of Isaac" by Ghiberti and Brunelleschi are on display in the museum of the Bargello in Florence. Differences between the "Sacrifice of Isaac" created by Brunelleschi and Ghiberti include the way that the panel was constructed and the overall efficiency of the panel. Brunelleschi's panel consisted of individual pieces of the figures of the artwork being placed onto the bronze framework. In contrast to Brunelleschi's method of creating the artwork on his panel, Ghiberti's casting of the art had all of the figures, with the exception of Isaac, created as one piece. The pieces of the figures themselves were all hollowed out on the inside. Due to the methods of how Ghiberti made the panel, it ended up being stronger, used less bronze, and had less weight than Brunelleschi's panel. By using less bronze, the panels were also more cost efficient. Including the aspect of the art itself, these differences were included on how the council of the competition decided on the victor.