•“Perfect” design: numerical harmony via squares & circles
•Plaster + pietra serena: color harmony
•Vertical space is split into thirds by architrave & drum ring
•Light is divided in thirds: lantern, oculi & drum windows
•Main floor is a square, while the small altar space is Vitruvian (i.e., a circle superimposed on a square)
•Original design: simple, with complexity that grows with the rising elevation
•Donatello spoiled this by adding rondels & overdoor sculptures to his bronze doors
•Tomb placement (Giovanni d’Medici) is theological: located beneath God (circle, light) and Heaven (the dome), perpetual prayers for the dead patriarch ascend & intercede
