The stolen smile: How the mona lisa became the world’s most famous work of art

This theft, almost comically amateurish, would transform a painting already admired into an unprecedented cultural phenomenon. How did a work that was merely one portrait among many in the French royal collections become this global myth, this face that even those who know nothing of art recognise instantly? The answer lies not only in Leonardo da Vinci’s genius, but in a strange alchemy of historical chance, media obsession, and that persistent enigma: why does her smile still haunt us, five centuries after it was painted?

01The master’s workshop: where science meets poetry

To understand the magic of the Mona Lisa, one must first step into Leonardo da Vinci’s workshop in Florence, around 1503. The air is thick with the scent of linseed oil and turpentine, while anatomical sketches lie scattered among designs for flying machines. It is here that this portrait takes shape, likely commissioned by Francesco del Giocondo to immortalise his wife, Lisa Gherardini. But Leonardo, never in a hurry, would never deliver the work. He took it with him to France, retouching it until his death in 1519, as if trying to capture something elusive.

What strikes one about this painting is its revolutionary technique. Leonardo layered up to thirty coats of glaze—those translucent veils of paint that give Mona Lisa’s skin its almost living luminosity. Under X-rays, one discovers that the background landscape was painted first, then overlaid with the figure, as if nature itself yielded to this mysterious presence. The sfumato—that technique of softening edges—creates an optical illusion: the smile seems to appear and vanish depending on the angle, like a fleeting emotion one thinks they’ve grasped before it slips away.

Mona Lisa’s hands, crossed with quiet elegance, are a masterpiece of anatomy. Leonardo, who dissected corpses to understand muscle function, rendered every tendon and vein with near-surgical precision. Yet this realism is only a facade. Everything in this portrait is constructed. The landscape behind her, with its winding rivers and improbable bridges, does not exist. It is a dream of Tuscany, a geography of the imagination where the laws of perspective dissolve into emotion.

02The sleeping Louvre: a forgotten masterpiece among masterpieces

At the beginning of the 20th century, the Mona Lisa was still just one treasure among many in the Louvre’s collections. She shared the Salon Carré with dozens of other paintings, hung haphazardly one above the other in the picturesque disorder of museums at the time. Few visitors paused before her; the Venus de Milo or Veronese’s Wedding at Cana were far more imposing. The guards, few in number and poorly paid, didn’t even bother to check if the paintings were properly secured. After all, who would think to steal a canvas that had hung there for centuries?

Yet the Mona Lisa already had a turbulent history. Napoleon had it taken down to hang in his bedroom, fascinated by her enigmatic smile. The Romantics of the 19th century, from Walter Pater to Théophile Gautier, turned her into an icon of mystery, describing her gaze as "an invitation to journey into the unknown." But despite this growing fame, she remained a work for connoisseurs, admired by scholars rather than the general public.

Everything changed on 22 August 1911, when the painter Louis Béroud arrived at the Louvre to make a copy of the Mona Lisa. In place of the painting, he found only a nail and four hooks. After an hour of waiting, a guard assured him the painting had probably been taken away for photography. But when Béroud returned later, the canvas was still missing. Panic set in: the Mona Lisa had indeed been stolen.

03The clumsy thief and the birth of a myth

The investigation that followed was worthy of a detective novel. The police questioned all of Paris: anarchists, eccentric collectors, even Pablo Picasso, who had bought Iberian statues stolen from the Louvre a few years earlier. Newspapers seized on the story, offering extravagant rewards. For two years, the mystery remained unsolved.

Then, in December 1913, a Florentine antique dealer received a letter signed "Leonardo": a certain Vincenzo Peruggia offered to sell him the Mona Lisa for 500,000 francs. The man, an Italian glazier who had worked at the Louvre, claimed he had acted out of patriotism, wanting to return to Italy what he saw as Napoleonic loot. In reality, Peruggia was a bumbling thief who had simply taken the painting down one morning, wrapped it in his smock, and walked out through the staff door.

Yet this shabby theft would have an unexpected effect: it turned the Mona Lisa into a global star. During the two years she was missing, newspapers around the world published articles, speculations, and outlandish theories. When she was finally recovered, vast crowds gathered to see her during her temporary exhibition in Florence and Rome. For the first time, people queued for hours to admire a single painting. The myth was born.

04The smile that fascinates the world

But why, among so many others, did this portrait capture the collective imagination? The answer may lie in that smile, at once present and elusive. Scientists have analysed its mystery: because of how our brains process visual information, Mona Lisa’s smile seems to vanish when we look at it directly, only to reappear when we glance away. It is as if she is playing with us, inviting us to search for what is not quite there.

Interpretations of this smile are endless. For Freud, it reflected Leonardo’s maternal complex. For feminists, it embodies the eternal feminine, both alluring and unattainable. Some see it as an allegory of nature, with the landscape evoking Leonardo’s geological studies. Others believe it is a disguised self-portrait: when Mona Lisa’s face is digitally overlaid with Leonardo’s drawings, unsettling similarities emerge.

What is certain is that this smile has endured through the ages, reinventing itself with each generation. The Surrealists made it a symbol of the unconscious; Pop artists turned it into a mass-culture icon. Today, she is everywhere: on mugs, T-shirts, internet memes. Her face has been appropriated by Banksy, recreated in Lego, even turned into an NFT. Yet despite this omnipresence, her mystery remains intact.

05The Mona Lisa in the 21st century: between veneration and saturation

Today, the Mona Lisa is a prisoner of her own fame. At the Louvre, she reigns in a room designed especially for her, behind bulletproof glass, under constant surveillance. Visitors crowd before her, armed with smartphones, trying to capture that elusive smile. Yet many leave disappointed: how can one appreciate a work when it must be viewed through a dense crowd, beneath the glare of camera flashes?

This saturation raises a crucial question: is the Mona Lisa still a work of art, or merely a symbol, a relic of Western culture? Some critics argue she is overrated, that other Renaissance portraits deserve equal attention. Others see her fame as proof of her universality: her smile speaks to everyone, whether art expert or casual tourist.

The Louvre itself seems torn. Should the original continue to be displayed, risking further damage? Some propose replacing it with a perfect copy, allowing visitors to admire it without the pressure of crowds. But such a solution would deny the unique aura of the original—the magic that makes millions still queue to see her, if only for a few seconds.

06Leonardo’s legacy: when art becomes legend

More than five hundred years after its creation, the Mona Lisa remains a mirror held up to our time. She embodies both artistic genius and the madness of celebrity, timeless beauty and rampant commercialisation. Her story reminds us that masterpieces are not born famous: they become so, often by accident, carried along by the currents of history.

Perhaps that is the secret of her immortality. The Mona Lisa is not just a painting: she is an enigma that each generation reinterprets, a smile that forever eludes us. And it is precisely this inability to fully grasp her that drives us to keep searching, again and again.

So the next time you encounter her gaze in a book, on a screen, or behind the bulletproof glass of the Louvre, remember: you are not just looking at a painting. You are contemplating the face of a mystery that, for five centuries, has refused to be solved. And that, perhaps, is why we love her so.