<human>:  Why is the Mona Lisa so famous?
<bot>: The Mona Lisa is famous because it’s a very good painting. It is a portrait of a woman, and it was painted by the Italian artist Leonardo da Vinci. The painting is known for its subtle use of color and light. It is also famous for its mystery. Many people believe that the painting is a self-portrait of the artist, Leonardo da Vinci, but there is no conclusive evidence to support this theory.