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What kind of wood panel supports the Mona Lisa?

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Mona Lisa by Leonardo da Vinci, oil painting showing a woman with a slight smile and folded hands, seated before a distant, hazy landscape. — Mona Lisa *Mona Lisa*, oil on wood panel by Leonardo da Vinci, 1503–19; in the Louvre, Paris.

The Mona Lisa, a famous oil painting by Leonardo da Vinci, is painted on a poplar wood panel.1

Over the centuries, this panel has experienced some warping due to resistance from its original frame and early restoration efforts. To address a small crack near the top of the panel, early restorers added dovetails to the back of the wood, and later efforts involved reinforcing the area with heavy canvas.2