The author's repetitive use of the "b" sound in the excerpt from "Birches" creates a musical quality to the language, adding rhythm and harmony to the lines. This gives a sense of the movement and motion he describes. Additionally, the repeated "b" sound enhances the imagery of swinging birches, as the repeated sound mimics the swaying and bending of the trees. Overall, the use of the "b" sound in the excerpt helps to emphasize the author's fascination with the physicality and playfulness of nature.

reword it and make it sound liek a 12 year old

The author uses a lot of "b" sounds in the "Birches" excerpt, and it makes the words sound like music. It adds rhythm and makes the lines flow nicely. It also makes us picture the birches swaying, because the sound is like their movement. It shows that the author really likes nature and thinks it's fun and cool.