He used bright yellow and orange to emphasize the fullness and vividness of flowers, and used dark green and dark blue strokes to increase the contrast and make the bouquet more conspicuous. The choice of these colors and strokes reflects Van Gogh's love for nature and praise for life. He believes that sunflower symbolizes loyalty, friendship and hope, and these themes often appear in his works. Sunflower series was born at the turning point of Van Gogh's life and artistic career. At that time, Van Gogh was spending a relatively stable time in arles, southern France, and established a profound friendship with the painter paul gauguin. These paintings are not only the catharsis of Van Gogh's personal feelings, but also reflect his interaction with the surrounding environment and his optimism about the future. VincentWillemvanGogh (Van Gogh for short) is a Dutch post-impressionist painter and a pioneer of expressionism. His works have a far-reaching influence on art in the 20th century. Van Gogh was born on1March 30th, 853. Van Gogh's representative works include Starry Moon Night, Sunflower Series, and Wheat Field with Crows.