Filippo Brunelleschi

• 1. Introduction

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  Filippo Brunelleschi looked up at a hole in the sky. Santa Maria del Fiore, the cathedral of Florence, had stood unfinished for more than a century. Its octagonal drum gaped open, waiting for a dome that no one in Europe knew how to build. The diameter was almost 42 metres. No buttresses were permitted. There was no timber strong enough or plentiful enough for conventional scaffolding. And yet in 1418, Brunelleschi entered the competition to solve the problem and won.

  He was not primarily an architect. He had trained as a goldsmith. He had once refused to share a commission with a rival rather than surrender control. He had sailed a boat that sank on its first voyage. He was, in 1421, the first person in the Western world to receive a patent. He would become, in the judgement of later generations, the founding father of Renaissance architecture, the inventor of linear perspective, and the first modern engineer.

  How does a goldsmith become the man who designs the most technically audacious dome since antiquity? And what did he leave behind when the lantern he designed was finally placed on top of the dome he never lived to see completed?

• 2. Goldsmith to Architect

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  Florence in 1377 was a city of guilds, and Brunelleschi was born into its professional hierarchies. His father, Brunellesco di Lippo, was a notary and civil servant, and the family belonged to the prosperous Spini clan, whose palace still stands across from the Church of Santa Trinità. The young Filippo was educated in literature and mathematics so he could follow his father into civic life. He had other ideas.

  At fifteen, he was apprenticed as a goldsmith and sculptor working in cast bronze. By December 1398, he had become a master craftsman and joined the Arte della Seta, the silk merchants' guild, which was also the wealthiest and most prestigious guild in Florence, counting jewellers and metal craftsmen among its members.

  His earliest surviving sculptures are a pair of small silver figures of saints, made between 1399 and 1400 for the altar of Saint James in Pistoia Cathedral. He briefly interrupted that work to serve on two representative councils of the Florentine government. Then came the competition that changed everything.

  Around the end of 1400, Florence resolved to add a second pair of sculpted and gilded bronze doors to the Florence Baptistery. Seven sculptors competed. Each had to produce a bronze panel showing the Sacrifice of Isaac within a Gothic four-leaf frame, complete with Abraham, Isaac, an angel, two additional figures, a donkey, and a sheep, rendered in a style that harmonised with the existing doors Andrea Pisano had made in 1330. The head of the jury was Giovanni di Bicci de' Medici, founder of the Medici dynasty and a man who would become one of Brunelleschi's most important patrons.

  The jury praised Lorenzo Ghiberti's panel first. When they examined Brunelleschi's, they could not choose between the two and proposed a collaboration. Brunelleschi refused any arrangement that would cost him sole control, and the commission went to Ghiberti. Rather than accept subordinate work in sculpture, Brunelleschi abandoned the art form almost entirely and turned his attention to architecture and optics.

• 3. Rome and the Ancient Ruins

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  Between 1402 and 1404, Brunelleschi travelled to Rome, almost certainly in the company of his younger friend, the sculptor Donatello. They went to look at rubble.

  The ruins of Ancient Rome were a fashionable topic among scholars, writers, and philosophers of the Early Renaissance, who saw classical antiquity as the cultural root that could displace the Byzantine models and Gothic art that dominated medieval visual culture. But few had actually studied the physical fabric of those ruins in close detail. Brunelleschi and Donatello did.

  What Brunelleschi took from Rome was specific and structural: he absorbed the principles behind even lighting, the minimisation of competing decorative elements within a single space, and the deliberate balancing of those elements to create a unified interior. These observations would shape everything he built afterward.

  Some historians question whether Brunelleschi went to Rome in 1402-1404 at all, pointing to the volume of work he had in Florence, the poverty and lawlessness of Rome at the time, and the absence of direct documentary evidence. His first definitively recorded stay in Rome is not until 1432. There is also a hypothesis, though disputed, that his later system of linear perspective grew out of his study of those ruins. Whatever the precise timing, the physical presence of structures like the Pantheon and the Baths of Diocletian left an unmistakable mark on his architectural thinking, and both were still standing when he could have seen them.

• 4. The Logic of Space

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  Between 1415 and 1420, Brunelleschi conducted a series of experiments that would determine how painters depicted three-dimensional space for the next four centuries. He made paintings showing the Florence Baptistery as seen from the entrance of the Cathedral, and the Palazzo Vecchio as viewed obliquely from its northwest corner on the Piazza della Signoria.

  According to his early biographer Antonio Manetti, whose account Giorgio Vasari later adopted, Brunelleschi used a grid to draw the scene square by square, producing a mirror image. He then calculated a geometric scale for objects at varying distances, discovering a systematic method for representing three dimensions on a flat surface. To test the accuracy of the result, he drilled a small hole through the painted panel. A viewer would look through the back of the painting at a mirror held in front of it; the mirror reflected Brunelleschi's composition, and the viewer could compare it directly with the actual scene behind the mirror. Both original panels have since been lost.

  The most important painting treatise of the Renaissance, Leon Battista Alberti's Della pittura, was published in 1436 and dedicated to "Pippo" Brunelleschi, the nickname Alberti himself gave him. Alberti described Brunelleschi's experiment in its third book. Masaccio's fresco The Holy Trinity, painted between 1425 and 1427 in the church of Santa Maria Novella in Florence, is an early demonstration of the new technique: it created the illusion of a three-dimensional vaulted space on a flat wall and adopted Brunelleschi's architectural style within the painted scene.

  Brunelleschi's studies were extended by Alberti, Piero della Francesca, and Leonardo da Vinci. The system they formalised governed pictorial depictions of space until the late 19th century.

• 5. Building the Impossible Dome

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  Santa Maria del Fiore had been under construction since 1296. After the death of its first architect, Arnolfo di Cambio, work stopped for fifty years. By the time Brunelleschi entered the 1418 competition, the proposed dome was already fixed in its specifications: more than 80 metres from base to lantern, with an octagonal base of almost 42 metres across. It was larger than the Pantheon and larger than any dome in Europe. Nothing of comparable scale had been built since antiquity.

  The city fathers had forbidden external buttresses. Conventional timber scaffolding was out of the question because there was not enough timber of sufficient length and strength in all of Tuscany for the task. The stresses of compression were poorly understood, and the mortars of the period took several days to set, meaning any scaffolding had to bear the weight of fresh masonry for a prolonged period. Brunelleschi won the competition with the assistance of a brick scale model built for him by Donatello.

  His solution was architectural and logistical. He constructed two domes, one inside the other. The outer dome protected the inner shell from rain and gave the structure its soaring profile; the inner dome bore the actual structural load. Twenty-eight ribs, horizontal and vertical, in marble form the frame; eight are visible on the outside. A narrow staircase runs between the two shells all the way to the lantern. More than four million bricks went into the octagonal structure. Brunelleschi left no building plans or diagrams explaining his method; scholars believe he treated the dome geometrically as though it were hemispherical, a form that allows a masonry shell to support itself without centring.

  He also invented the hoisting machine used to raise the masonry, a device that may have been inspired by his reading of Vitruvius' De architectura, which described Roman lifting equipment used in the first century AD during the construction of the Pantheon and the Baths of Diocletian. Leonardo da Vinci later sketched and admired that machine. Brunelleschi also introduced wooden and sandstone chains as tensioning rings around the base of the dome, which reduced the outward thrust that would otherwise have required flying buttresses. The herringbone brick-laying pattern he employed, known as opus spicatum, appears to have been a technique lost to European builders before the dome's construction.

  His management of the workforce was just as deliberate as his engineering. Rather than send workers down the hundreds of steps for their breaks, he brought food and diluted wine up to them, the same diluted wine given to pregnant women at the time, judging that the exertion of repeated descents and ascents would exhaust them and cut productivity.

  The dome itself was completed in 1436. A competition was held that same year for the decorative lantern at its peak, and Brunelleschi won it again, once more against Ghiberti. He designed the lantern and built its base, but he died on the 15th of April 1446, before it was installed. The lantern was finished around 1461. Four hemispherical exedra, small half-domes set against the drum of the main dome in the Roman manner, which Brunelleschi designed in 1438, were completed between 1439 and 1445. Their double-columned pilasters and horizontal entablatures influenced the Tempietto of San Pietro in Montorio built in Rome by Bramante in 1502.

• 6. A Patent and a Sunken Ship

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  In 1421, the same year he began work on the dome competition, Brunelleschi received what is regarded as one of the first modern patents ever granted in the Western world. The patent covered a river transport vessel intended to carry marble more cheaply than existing methods, described in the grant as able to "bring in any merchandise and load on the river Arno etc for less money than usual, and with several other benefits." Historians of patent law note him as holding a special place in that history, partly because the patent represented a deliberate attempt to operate as an individual inventor outside the constraints of the guilds and their monopolies on trade.

  Six years later, in 1427, he put the idea into practice by building a large boat called Il Badalone, designed to carry marble from Pisa to Florence up the River Arno. Il Badalone sank on its maiden voyage, taking a substantial share of Brunelleschi's personal fortune with it.

  His interests in engineering extended well beyond boats and construction cranes. He designed hydraulic machinery, elaborate clockworks, and theatrical contrivances for churches. These last were elaborate mechanical systems by which actors representing angels and saints were made to fly through the air during performances re-enacting Biblical miracles, accompanied by explosions of light and fireworks during state and ecclesiastical visits. At least one such mechanism, built for the church of San Felice, is confirmed in historical records. None of the machinery survives.

• 7. Legacy in Stone

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  Brunelleschi is buried in the crypt of Santa Maria del Fiore, the cathedral whose dome defined his life. Antonio Manetti, who knew him personally and wrote his biography, recorded that Brunelleschi "was granted such honours as to be buried in the Basilica di Santa Maria del Fiore, and with a marble bust, which was said to be carved from life, and placed there in perpetual memory with such a splendid epitaph." The epitaph inside the cathedral entrance reads: "Both the magnificent dome of this famous church and many other devices invented by Filippo the architect, bear witness to his superb skills. Therefore, in tribute to his exceptional talents, a grateful country that will always remember him buries him here in the soil below."

  A statue of Brunelleschi was later placed in the square in front of the cathedral, facing upward toward the dome.

  In 1434, the guild of masters of stone and wood had him arrested for practising architecture without being a member of their guild. He was released quickly, and the guild itself was charged with false imprisonment. He was a member of the silk merchants' guild, not the architects' guild, to the end of his life.

  He adopted one child, Andrea di Lazzaro Cavalcanti, in 1415, who took the name Il Buggiano after his birthplace and became Brunelleschi's sole heir. The columns for the facade of Santo Spirito, his last major commission, were delivered ten days before his death. The facade was not completed until 1482, more than three decades after he died, and was later modified again in the 18th century. His unfinished Santa Maria degli Angeli, which Leon Battista Alberti called the "first complete plan of a Renaissance church" in the first major treatise on Renaissance architecture, reached its fullest realisation not in Florence but in Rome, in Michelangelo's Saint Peter's Basilica, where the central-plan design Brunelleschi had pioneered was finally built beginning in 1547.