In the sentence "Red, orange, yellow, green, blue, indigo and purple", the author borrows the legend about rainbows in folk ci-poetry, and vividly uses the poem "Who dances in the sky with colorful exercises" to describe the gorgeous and blue-sky scenery under the setting sun after rain, which is magnificent and vivid.
This sentence comes from Mao Zedong's Bodhisattva Bodhisattva, which was written by Mao Zedong, a modern politician, thinker and writer, in the summer of 1933. With a cheerful style, it depicts a magnificent scene of colorful cypress land after rain.