Good morning.

Today, a cathedral that stood roofless for a hundred and forty years… because no one alive knew how to close the hole.

Let’s begin.

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The Dome Left Unbuilt for 140 Years

Florence Cathedral · Filippo Brunelleschi

F	lorence, Italy. The 1290s. Builders began a new cathedral, Santa Maria del Fiore, and designed it to end in a dome wider than any built since ancient Rome. They had no idea how to actually build one.

The walls rose. The hole at the top stayed open. A dome that wide, over forty‑five metres across, could not be built the normal way, propped up from below on a wooden frame called centering. No forest in Tuscany held enough timber for scaffolding that size, and no one could say what would hold the dome up while it dried.

For over a century, the cathedral simply waited, open to the sky.

“Who is so hard‑hearted… as not to be moved with the greatest admiration for the structure that rises above the skies?”

Leon Battista Alberti, writing about the finished dome, 1436

In 1418, the cathedral’s overseers finally opened a competition. Whoever could solve the dome would build it. A goldsmith with no formal training in architecture entered… and this is what he eventually raised.

The move Washington made in 1934

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Brunelleschi's Dome, Florence Cathedral, at sunset

Brunelleschi’s dome, Florence Cathedral. Completed 1436. Still the largest masonry dome ever built.

Filippo Brunelleschi (1377–1446) trained as a goldsmith in Florence. Seventeen years earlier, in 1401, he had lost a famous competition to design bronze doors for the city’s Baptistery. The winner was a younger goldsmith named Lorenzo Ghiberti. Brunelleschi never forgot the loss, and he entered the dome competition determined to win this one alone.

Legend says he proved his cleverness with an egg. He challenged the other architects to make it stand upright on a marble table. Each tried and failed. Brunelleschi cracked its base flat, stood it up, and won the room. When the others complained anyone could do that, he said the same was true of his dome, once he showed them how.

The overseers, still nervous, named Ghiberti co‑supervisor alongside him. Brunelleschi is said to have faked an illness to expose how little Ghiberti actually understood the engineering, and Ghiberti was gradually sidelined within a few years.

Cutaway diagram of the Dome of Florence Cathedral, showing the double shell

A cutaway of the dome, showing the double shell: an inner dome carrying an outer one.

His solution had no wooden scaffold at all. He designed two shells, one nested inside the other, both self‑supporting as they rose. Workers laid the bricks in a herringbone pattern, angled bricks locking each ring in place before the mortar even dried, so gravity itself held each course up while the next one was added.

He also invented machines nobody had seen before: a giant ox‑powered hoist that could lift stone hundreds of feet, with reverse gears so the same ox could lower a load without ever being unharnessed and turned around.

“I can build a dome bigger, but not more beautiful.”

Michelangelo, reportedly on his own dome for St Peter’s Basilica, Rome

A surviving wooden model of the dome, used to plan the construction.

The dome took sixteen years to build. It was consecrated in 1436 by Pope Eugene IV. Brunelleschi died a decade later and was buried in the cathedral’s crypt, an honour almost never given to an architect rather than a saint or a pope.

If you want the engineering explained by people who actually tried to rebuild parts of it, this documentary is worth the hour: Great Cathedral Mystery, NOVA →

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Three Things Worth Knowing

I	Art The Doors That Beat Him First

Ghiberti’s winning Baptistery doors took him over twenty years to finish. Michelangelo later called them “the Gates of Paradise,” a nickname that stuck permanently, meaning the man who beat Brunelleschi in 1401 still gets remembered for it today.

II	Literature A Play About the Dome

Brunelleschi was also an amateur prankster. He once wrote and staged an elaborate practical joke convincing a Florentine carpenter that he had become someone else entirely, a trick so cruel and so famous it was later written down as a short story still read in Italy today.

III	Le Mot Juste Centering

The wooden frame builders normally use to hold up an arch or a dome while its mortar sets. Brunelleschi’s dome needed none, which is precisely why nobody believed it could be built until he actually built it.

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Curious & Controversial

◆	In 1434, guild officials jailed Brunelleschi for a few days over an unpaid membership fee to the stonemasons’ guild, work stopped on the dome while its own architect sat in a Florentine cell.

◆	Engineers still argue over how much the herringbone brick pattern actually mattered versus the double‑shell design. No original construction drawings survive, so parts of the method are reconstructed from the finished building itself.

◆	Brunelleschi never wrote down his method and guarded it jealously his entire life. Historians still debate exactly how he solved several structural problems that, on paper, should not have worked.

Filippo Brunelleschi, the goldsmith who solved a problem architects had given up on.

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Connoisseur’s Diary

Worth Seeing This Week

You can climb 463 steps inside the double shell itself, between the inner and outer dome, to the lantern at the top.

Where: Piazza del Duomo, 50122 Florence, Italy. Tickets: from €30, timed entry, book well ahead in season. Insider tip: the climb is narrow and one‑way in places, so claustrophobia is a real concern, not a joke. Book the dome climb at duomo.firenze.it →

Worth Reading

Brunelleschi’s Dome — Ross King (2000). The full engineering story, told without needing an architecture degree to follow it.

Explore Further

Watch: Great Cathedral Mystery, NOVA →, on how modern engineers tested Brunelleschi’s methods.

Browse: duomo.firenze.it →, the cathedral’s official site, with a full history of the construction and current visiting rules.

Tonight’s Quiz

1. Why couldn’t Florence build its dome for over a hundred years?

A) No architect had agreed to the design

B) It was too wide to build with a wooden support frame

C) The city ran out of money

D) A war stopped construction

Answer: B. No forest could supply timber for a support frame that wide, and no one knew another way to build it, until Brunelleschi’s double‑shell design.

2. Who beat Brunelleschi in an earlier competition, in 1401?

A) Donatello

B) Lorenzo Ghiberti

C) Leon Battista Alberti

D) Michelangelo

Answer: B. Ghiberti won the Baptistery doors competition. He was later named Brunelleschi’s co‑supervisor on the dome, and gradually sidelined within a few years.

3. What replaced a wooden support frame during construction?

A) Iron chains alone

B) A double shell with self‑locking herringbone brickwork

C) A temporary stone pillar in the centre

D) Scaffolding rebuilt from ships’ masts

Answer: B. The herringbone brick pattern let each ring lock in place and support itself before the mortar dried.

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A goldsmith with a grudge solved a problem the best architects in Europe had given up on. He never wrote his method down, and guarded it so closely that parts of it are still debated today.

Next time someone tells you a problem has no solution… remember it took Florence a hundred and forty years to find its architect, not its answer.

Until tomorrow,
Charles T. Mayfair