Lego artist Brian Korte is building a replica of the masterpiece out of 12,000 Lego bricks.
He worked on it at the Frazier Museum all day Thursday, and is expected to finish it Friday afternoon.
The completed portrait will hang in the museum's gallery until September 18. Then it will be raffled off.
It's part of the museum's latest exhibit called "da Vinci, the genius."
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