<human>:  Why is the necklace in the painting ‘The Coronation Necklace’ by Van Gogh so big?
<bot>: The painting is a portrait of the artist’s mother. The necklace is a symbol of her love for her son. Van Gogh was a very talented artist, and he was also a very sensitive person. He was very close to his mother, and he was very sad when she died.