What makes a children's book a "classic"?

For me a book is a classic if no matter how many times you read it, you always find something about it that makes you see the world in a different way.   A classic book becomes a part of you, and stays with you your entire life.

What do you think makes a book a classic?  Do you think the Harry Potter books are classics, or will be considered classics in the future?   How long do you have to wait to determine if a book is a classic?

Real Story Behind Bridge to Terabithia by Katherine Paterson

Did you know that Katherine Paterson's 1978 classic "Bridge to Terabithia" was inspired by a real life events from her son's childhood?  Click on "Read More" below to learn more.

*Spoiler Alert*