Ask HN: Some less known books that are absolute favorites of yours

What are some less known books that are absolute favorites of yours?

Bonus points if:

1. You've read them as an adult

2. You've re-read them

3. You've enjoyed _the process_ of reading them — perhaps they are beautifully written or perhaps they made you laugh

4. They've impacted your life in a positive way

Both non-fiction and fiction books are welcome!

If you feel like it, please consider including a 1-2 sentence description or quote.

Thank you!