Identifying Author's Purpose in Descriptive Writing

In the vibrant world of literature, authors craft their messages with care, ensuring that every word contributes to their intended purpose. One such author describes the bright colors of a summer garden, the lively sounds of nature, and the joyful expressions on the faces of children playing. The passage reflects on how these elements come together to create a feeling of happiness and tranquility in the reader's mind.

From this context, consider the author's intent for describing the summer garden so vividly. What was the primary purpose behind this description?