How nail art became an Olympic beauty ritual

As Olympic sprinter Dina Asher-Smith sailed over the finish line in the women's 100 meter semifinals, photos captured her vibrant blue nails as she celebrated. It may have seemed like just another of Asher-Smith's stylish competition looks, but zooming in on her manicure revealed a meticulous recreation of a Japanese masterpiece: Hokusai's "The Great Wave off Kanagawa."
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