What is and the stars came out they danced about an example of?

The phrase "and the stars came out they danced about" is an example of personification. Personification is a figure of speech in which human qualities are attributed to an animal, object, or idea. In this case, the stars are given the human quality of dancing, which suggests that they are joyful and carefree. This use of personification helps to create a sense of wonder and magic in the scene.