Meaning: The fireflies moved gracefully and playfully in the night sky during the summer.
Choice of Words: The verb "danced" is used to describe the way the fireflies move. It suggests a graceful and playful motion. The adverb "magically" describes the way in which the fireflies are dancing. The preposition "in" indicates the time when the fireflies are dancing. The noun "summer night" refers to the night during the summer season.