Facts about Mona Lisa
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France's King Francis I acquired the Mona Lisa directly from Leonardo da Vinci, making it one of the earliest paintings to enter a royal collection.
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Stolen in 1911, the Mona Lisa hung in the Louvre for only 77 years before its theft, yet had already achieved legendary status among European artists and intellectuals.
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During a 1962 cleaning, restorers discovered that the painting's background landscape was originally much brighter, with blue skies and green hills now obscured by centuries of accumulated grime and varnish yellowing.
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Over 500 years, the Mona Lisa's poppy seed oil-based paint has oxidized and darkened, shifting the painting's original bright greens and warm flesh tones toward the brownish hues visible today.
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Decay of the painting's varnish has yellowed the Mona Lisa significantly over five centuries, making the original colors noticeably darker and warmer than Leonardo intended.
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Smile analysis by facial recognition software reveals that Lisa Gherardini's mouth curves upward by merely 0.7 millimeters, yet this subtle asymmetry creates the painting's famously enigmatic expression.
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Approximately 9 million people view the Mona Lisa annually at the Louvre, making it the most visited artwork in the world by a significant margin.
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At 77 by 53 centimeters, the Mona Lisa is surprisingly small, yet its dimensions have made it one of the most recognizable paintings in human history despite its modest size.
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X-ray examinations conducted in 1952 revealed that Leonardo painted over a completely different composition underneath the Mona Lisa's final portrait.
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Sitter Lisa Gherardini's identity remained unknown for nearly 300 years until 1550, when Giorgio Vasari first documented her as the wife of Florentine merchant Francesco del Giocondo.
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Visitors to the Louvre must view the Mona Lisa behind bulletproof glass, installed after the 1911 theft to protect the painting from further damage or theft.
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In 1919, Brazilian aviator Alberto Santos-Dumont offered to buy the Mona Lisa from the Louvre for one million francs to return it to Italy after its theft eight years prior.
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The 77 by 53 centimeter oil painting has been stolen once, in 1911, when Italian handyman Vincenzo Peruggia removed it from the Louvre's walls.
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Leonardo da Vinci painted the Mona Lisa between 1503 and 1519, using a technique called sfumato to create soft, almost imperceptible transitions between colors and tones.