Emperor Evonne of the Northern Song Dynasty was good at painting flowers and birds. On one occasion, he took an examination of a poem "Step on flowers to get rid of horseshoe fragrance". A painter is original. He did not simply focus on the individual words in the poem, but on the basis of fully understanding the poetry, he focused on the word "Xiang" at the end of the poem. His picture is: on a summer sunset evening, an official who played all day rode back to the village. Horses galloped, horseshoes held high, and several butterflies chased horseshoes.