On Sunday Morning while church bells rang in the village along shore the world and its mistress returned to Gastby's house and twinkled hilariously on his lawn. What figure of speech is this?

The use of "twinkled" is a metaphor, comparing the girl to a star.

The figure of speech in the given sentence is personification. Personification is a literary device in which non-human objects or qualities are given human characteristics or actions. In this case, the world and its mistress are being described as returning to Gatsby's house and twinkling hilariously on his lawn, which are human actions.

To identify the figure of speech in a sentence, you need to understand the meaning of each term and analyze how it is being used. In this case, "the world and its mistress" refers to the earthly realm and all of its possessions, while "returning to Gatsby's house" and "twinkling hilariously on his lawn" are actions associated with humans, not abstract concepts. This anthropomorphization gives human-like qualities to non-human entities, thus making it an example of personification.