Editing Filippo Brunelleschi (section)

===Basilica of Santo Spirito (1434–1466)===
The Basilica of [[Santo Spirito, Florence|Santo Spirito]] in Florence was his next major project, which, characteristically, he carried out in parallel with his other major works. Though he began designing in 1434, construction did not begin until 1436, and continued beyond his lifetime.  The columns for the facade were not delivered until 1446, ten days before his death, and the facade was not completed until 1482, and then was modified in the 18th century. The bell tower was also a later addition.{{sfn|Gärtner|1998|pp=44–55}}

Santo Spirito is an example of the mathematical proportion and harmony of Brunelleschi's work.  The church is in the form of a cross. The choir, the two arms of the transept, and the space in the center of the transept are composed of squares exactly the same size.  The continuation of the nave contains four more identical squares. and a half-square (a later addition) at the end. The length of the transept is exactly one-one half of the length of the nave.  Each square of the lower collateral naves is one-quarter the size of the squares in the principal nave.  The collateral naves are lined with thirty-eight small chapels, which were later filled with altars decorated with works of art.{{sfn|Gärtner|1998|pp=44–55}}

The vertical plan is also perfectly in proportion; the height of the central nave is exactly twice its width, and the height of the collateral naves on either side are exactly twice their width. Other aspects of his original plan, however, were modified after his death. The main aisle of the nave, lined by columns with Corinthian capitals, is topped by a row of semicircular arches, like his galleries.  His original plan called the ceiling of the nave to be composed of a [[barrel vault]], which would have echoed the collateral naves, but this was also changed after his death to the flat coffered ceiling. Little remains of the exterior walls that he had planned.  They were unfinished at his death and were covered with a facade in a different style in the [[Baroque architecture|Baroque period]].{{sfn|Gärtner|1998|pp=44–55}}
<gallery mode="packed" heights="200">
File:Santo Spirito, inside 1.JPG|Central nave of Santo Spirito
File:Chiesa di Santo Spirito (15796831252).jpg|The dome of Santo Spirito
File:Santo Spirito Grundriss Brunelleschi Filippo Florenz I 8c100589.jpeg|Brunelleschi's plan of Santo Spirito
File:Santo Spirito, sagrestia di giuliano da sangallo, capitelli 02.JPG|Detail of the classical pilasters of the Sacristy
</gallery>