Does the author use autumn as a springboard to discuss big ideas or does he discuss autumn simply for its own sake?

Your question is very vague. It requires clarification such as the name of the author and book you're referencing. If you are referencing a specific piece of literature, it's important to also recognize that sometimes the reality is that authors do not actually have a preconceived idea in their head regarding a particular Word, or subject. Or, from your question, sometimes autumn IS simply a reference to autumn.

Feel free to re-post with further info if that's the case! Have a great one...