Mona Lisa

Every year, nearly 10 million people pour through the Louvre, and most of them are headed toward a single panel of painted poplar wood, 77 by 53 centimeters in size—smaller than a flat-screen TV. The Mona Lisa hangs behind bulletproof glass, perpetually mobbed, unreachable within five meters by almost anyone. Given the underwhelming viewing experience, why does the entire world make this pilgrimage? The answer isn’t in the brushstrokes. It’s in the 500-year collective obsession that smile has triggered.

Leonardo da Vinci invented a painting technique called sfumato—Italian for “smoke.” He built up dozens of translucent glaze layers, each thinner than two micrometers, dissolving the outlines into shadow. This is why the curve at the corner of her mouth exists in a kind of quantum superposition: look directly at it and she seems neutral; catch it with your peripheral vision and she is unmistakably smiling. In 2008, Canadian scientists ran the painting through emotion-recognition software and concluded: 83% happiness, 9% disgust, 6% fear, 2% anger. No algorithm has yet explained where the 2% anger comes from—or why it feels specifically directed at you.

The mainstream consensus is that she is Lisa Gherardini, wife of Florentine silk merchant Francesco del Giocondo—hence the Italian title La Gioconda. But over the centuries, dissenters have proposed alternatives: a secret daughter of Leonardo, his cross-dressing apprentice Salai, even a feminized self-portrait of the master himself. In 2011, researchers reported finding what appeared to be the letters L and S—for Leonardo and Salai—hidden in the whites of her eyes. The mystery has never been resolved. But the mystery itself has become the painting’s greatest selling point.

If the Mona Lisa had never been stolen, you might not have heard of it. On August 21, 1911, an Italian carpenter named Vincenzo Peruggia walked out of the Louvre with the painting tucked under his work smock. The museum closed for a week. France was stunned. Pablo Picasso was briefly detained for questioning. The painting sat in Peruggia’s apartment for two full years before he tried to sell it to a Florentine art dealer and was caught. During those two years, photographs of the Mona Lisa saturated newspapers worldwide, generating an obsession that no other artwork had ever achieved. In the year after its return, visitor numbers were six times the pre-theft average. The heist was the Mona Lisa’s true coronation as the world’s most famous painting.

Napoleon kept the Mona Lisa hanging in his private bedroom for four years, reportedly gazing at her every night before sleep. Baudelaire called her the embodiment of eternal feminine allure. Freud, in his 1910 biography of Leonardo, spent considerable pages analyzing the smile as a displacement of the artist’s repressed memory of his dead mother—the smile, he argued, echoed the gaze Leonardo’s mother had given him in infancy, a longing he spent a lifetime trying to recreate in paint. Andy Warhol, in 1963, silk-screened her thirty times on a single canvas, converting the sacred into the commodity. It was perhaps the sharpest—and most affectionate—critique the painting has ever received.