Did you know that Leonardo da Vinci painted the Mona Lisa, which is a very famous painting. He started working on it in 1503 and spent a lot of time perfecting every detail. He was never happy with it and kept changing it, even when he was working on other things. He died in 1519 and the painting stayed with him until it was later added to the royal collection in France. People all over the world were fascinated by Da Vinci's work. However, Da Vinci never considered his work finished and always tried to make it better. He had a strong desire to achieve perfection.