Alliteration

a figure of speech in which the same sound appears at the beginning of two or more words. Alliterative words are consecutive or close to each other in the text.

Example From Text

...the summer sun sweetened the blueberries on the vine.

Explanation

Here, the "S" sound is repeated when the author writes "summer sun sweetened". This alliteration emphasizes the warm, peaceful life that the Humans enjoyed long ago.