''Here comes the princess now heaven walks on earth'', illustrates the use of

The phrase "heaven walks on earth" is an example of a metaphor. A metaphor is a figure of speech that refers to one thing by mentioning another thing, in order to draw a comparison between them. In this case, the speaker is comparing the princess to heaven, implying that she is pure, beautiful, and divine. The metaphor is used to emphasize the princess's importance and to create a powerful image in the reader's mind.