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pilasters on the facade the vaults show no rips on both ends feigned door frames with typanums decorate the walls three doors equally apart from one another open to the interior this first arcade with its clear reference to classical antiquity in its simple form and decoration became an established model for numerous renaissance buildings across europe 28 the building s style was dignified and sober with no displays of fine marble or decorative inlays the glazed terracotta reliefs in the tondos by andrea della robbia were put up not until 1490 30 arcade of the foundling hospital 1419 1445 on the piazza of santissima annunziata with its corresponding portico by giovanni battista caccini 1601 cloister of men of the foundling hospital 1419 1445 corinthian column in the cloister thereafter brunelleschi was awarded additional commissions like the ridolfi chapel in the church of san jacopo sopr arno not surviving and the barbadori chapel in santa felicita since modified in both projects brunelleschi devised elements already used in the ospedale degli innocenti and which would also be used in the pazzi chapel and the sagrestia vecchia in these first projects he piloted ideas which he would later employ in his most famous work the dome of the cathedral of florence basilica of san lorenzo 1421 1442 edit brunelleschi undertook the major project of the basilica of san lorenzo soon after he had begun the foundling hospital the former cathedral of florence became again the largest church of the city through the sponsorship of the medici family as their parish church and mausoleum numerous architects worked at the church including michelangelo brunelleschi designed the central nave with the two collateral naves on either side later lined by small chapels and the old sacristy citation needed the first stage of the project was the sagrestia vecchia the old sacristy built between 1419 and 1429 southwest of the existing church on the initial rebuildable ground it houses the tomb of giovanni di bicci de medici and his wife piccarda bueri the chapel is a cube with a lateral length of about 11 metres 36 feet covered with a hemispheric dome that is without any decoration beside its twelve ribs that converge in an oculus and the oculi of the arched tambour which serve as light source a level of ornamental entablatures divides the vertical space into two parts and fluted pilasters at the edges structure the walls by using classical elements in an innovative way the interior established itself as a standard in renaissance architecture 31 in the church itself slender columns with corinthian capitals along the nave replace the former massive pillars instead of traditional vaults a coffered ceiling of square compartments with delicately gilded trim covers the central nave its height is realized by a second story pierced by upright arched windows oculi above each chapel bridge the difference in height to the side aisles the new interior projected an impression of harmony and balance 32 brunelleschi used white walls in the old sacristy which became a common element of renaissance architecture leon battista alberti who wrote the standard text on architecture of the time 1452 argued that according to prominent classical authors like cicero and plato white was the only color suitable for a temple or church and praised the purity and simplicity of the color like that of life 33 nave of the basilica of san lorenzo 1425 1442 san lorenzo capital and elaborated impost of a column in the nave view of the old sacristy sagrestia vecchia vault of the old sacristy florence cathedral dome 1420 1461 edit santa maria del fiore was the cathedral and symbol of florence which had been begun in 1296 after the death of the first architect arnolfo di cambio work was interrupted for fifty years the campanile or bell tower was begun by giotto soon after 1330 between 1334 and 1366 a committee of architects and painters made a plan of a proposed cupola and the constructors were sworn to follow the plan the proposed dome from the base to the lantern on top was more than 80 m 260 ft high and the octagonal base was almost 42 m 138 ft in diameter it was larger than the dome of the ancient pantheon or any other dome in europe and no dome of that size had been built since antiquity 34 a competition was held in 1418 to select the builder and other competitors included his old rival ghiberti it was won by brunelleschi with the help of a brick scale model of the dome made for him by his friend the sculptor donatello 34 since buttresses were forbidden by the city fathers and because obtaining rafters for scaffolding long and strong enough and in sufficient quantity for the task was impossible how a dome of that size could be constructed without it collapsing under its own weight was unclear furthermore the stresses of compression were not wholly understood and the mortars used in the period would set only after several days keeping the strain on the scaffolding for a long time 35 the work on the dome built 1420 1436 the lantern built 1446 c 1461 and the exedra built 1439 1445 occupied most of the remainder of brunelleschi s life 36 brunelleschi s success can be attributed to his technical and mathematical genius 37 more than four million bricks were used in the construction of the octagonal dome notably brunelleschi left behind no building plans or diagrams detailing the dome s structure scholars surmise that he constructed the dome as though it were hemispherical which would have allowed the dome to support itself 38 brunelleschi constructed two domes one within the other a practice that would later be followed by all the successive major domes including those of les invalides in paris and the united states capitol in washington the outer dome protected the inner shell from the rain and allowed a higher and more majestic form the frame of the dome is composed of twenty eight horizontal and vertical marble ribs or eperoni eight of which are visible on the outside the visible ones are largely decorative since the outer dome is supported by the structure of the inner dome a narrow stairway runs upward between the two shells to the lantern at the top 34 brunelleschi invented a new hoisting machine for raising the masonry needed for the dome a task maybe inspired by vitruvius de architectura which describes roman machines used in the first century ad to build large structures such as the pantheon and the baths of diocletian structures still standing which he could have seen for himself this hoisting machine would be admired by leonardo da vinci years later 39 the strength of the dome was improved by the wooden and sandstone chains invented by brunelleschi which acted like tensioning rings around the base of the dome and reduced the need for flying buttresses so popular in gothic architecture 40 the herringbone brick laying pattern opus spicatum which brunelleschi may have seen in rome was also seemingly forgotten in europe before the construction of the dome 41 brunelleschi kept his workers up in the building during their breaks and brought food and diluted wine similar to that given to pregnant women at the time up to them he felt the trip up and down the hundreds of stairs would exhaust them and reduce their productivity 42 once the dome was completed a new competition was held in 1436 for the decorative lantern on top of the dome once again among others against his old rival ghiberti brunelleschi won the competition and designed the structure and built the base for the lantern but he did not live long enough to see its final installation atop the dome 43 in 1438 brunelleschi designed his last contribution to the cathedral four hemispherical exedra or small half domes following a roman model set against the drum the upright base of the main dome the four small domes were altered and arranged to appear like a stairway of domes mounting upward they were purely decorative and were enriched with horizontal entablatures and vertical arches pilasters and double columns the technological advancements of gunpowder and portable cannons required a new system of fortification which led to further development of the double shelled dome 44 their architectural elements inspired later high renaissance architecture including the tempietto of san pietro in montorio built in rome by bramante 1502 a similar structure appears in the late 15 century painting known as the ideal city of urbino 45 the new designs fulfilled the need for the architectural expression for the status of ruling kings and princes while the strong dome structure symbolized the protection of their interests and bloodline 46 dome of the cathedral plan of the dome showing the inner and outer shells interior structure of the dome pazzi chapel 1430 1444 edit the pazzi chapel in florence was commissioned in about 1429 by andrea pazzi to serve as the chapter house or meeting place of the monks of the monastery of santa croce like nearly all of his works the actual construction was delayed beginning only in 1442 and the interior was not finished until 1444 the building was completed twenty years after his death in about 1469 including some of the details such as the lantern on top of the dome 47 the portico of the chapel is especially notable for its fine proportions simplicity and harmony its centerpiece is a sort of arch of triumph its six columns support an entablature with sculpted tondos an upper level divided by pilasters and a central arch and another band of sculpted entablature at the top below a terrace and the simple cupola the interior space is framed by arches entablatures and pilasters all in local pietra serena the floor is also divided into geometric sections light comes downward from the circular windows of the dome and changes throughout the day the interior is given touches of color by circular blue and white glazed terracotta reliefs by luca della robbia the architecture of the chapel is based on an arrangement of rectangles rather than squares which makes it appear slightly less balanced than the old sacristy of san lorenzo 47 facade of the pazzi chapel plan of the pazzi chapel interior of the pazzi chapel with reliefs in tondos by luca della robbia santa maria degli angeli 1434 1437 edit santa maria degli angeli was an unfinished project by brunelleschi which introduced a revolutionary concept in renaissance architecture churches since the romanesque and gothic periods were traditionally in the form of a cross with the altar in the crossing a central chapel or an apse santa maria deli angeli was designed as a rotunda in an octagonal shape with each side containing a chapel and the altar in the center the financing of the church came from the legacy of two florentine merchants matteo and andrea scolari and construction commenced in 1434 however in 1437 the money for the church was seized by the florentine government to help finance a war against the neighboring city of lucca the structure which had reached a height of 7 m 23 ft was never completed as brunelleschi designed it the completed part was later integrated into a later church of a different design 48 the plans and model of brunelleschi s church are lost and it is known only from an illustration in the codex rustici from 1450 and from drawings of other architects leon battista alberti in his de re aedificatoria the first major treatise on renaissance architecture written around 1450 and printed in 1485 hailed the design as the first complete plan of a renaissance church leonardo da vinci visited florence in about 1490 studied brunelleschi s churches and plans and sketched a plan for a similar octagonal church with radiating chapels in his notebooks it reached its fruition on an even larger scale in the 16th century donato bramante proposed a similar central plan with radiating chapels for his tempieto and later on an even larger scale in his plan for saint peter s basilica 1485 1514 49 the central plan was finally realized with some modifications beginning in 1547 in saint peter s by michelangelo and its deviating completion by carlo maderna 50 1450 codex rustici drawing showing brunelleschi s proposed octagonal church lower right brunelleschi s rotunda from santa maria degli angeli only the lower wall remains of his original design plan of the rotunda of santa maria degli angeli michelangelo s plan for saint peter s basilica rome 1546 superimposed on the earlier plan by bramante basilica of santo spirito 1434 1466 edit the basilica of santo spirito in florence was his last major commission which characteristically he carried out in parallel with his other works though he began designing in 1434 construction did not begin until 1436 and continued beyond his lifetime the columns for the facade were delivered in 1446 ten days before his death the facade was finally completed in 1482 and then was modified in the 18th century the bell tower is also a later addition 51 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 the half square at the end is a later addition the length of the transept is exactly half of the total length of the nave each square of the lower collateral naves is one quarter the size of the squares in the principal nave the side aisles are lined with thirty eight small chapels which were later fitted with altars decorated with devotional art works 51 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 moulded arches 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 baroque style 51 central nave of santo spirito brunelleschi s plan of santo spirito detail of the classical pilasters of the sacristy accomplishments edit linear perspective edit main article perspective graphical besides his accomplishments in architecture brunelleschi is also credited as the first person to describe a precise system of linear perspective this revolutionized painting opening the way for the naturalistic styles from renaissance art until the 19th century 52 he systematically studied why and how objects buildings and landscapes change their shape and lines appear to converge when seen from a distance or 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