: The meme usually circulates on message boards and social media as a "did you know" factoid, playing on the absurdity of linking a 16th-century masterpiece with a modern adult performer.
: Leonardo used sfumato , a method of layering thin glazes of oil paint to create soft, smoky transitions between colors and tones, making her smile appear to change depending on how it is viewed. mona lisa peter north
For further help, please provide context (e.g., where you saw the phrase) if you need a more specific explanation. : The meme usually circulates on message boards