Brunelleschi is at his most elegant in the Old Sacristy at the end of the left transept (site of a few Medici tombs), decorated with four Donatello wall-medallions (the artist himself is buried in the left transept).
The Old Sacristy, where some Medici tombs are found, is adorned by the art of Donatello.
Donatello alone designed the entirety of the Old Sacristy.