What does the jail in To Kill a Mockingbird represent?

the knothole in the tree?

the Radley house?

Please help with any of these... I'm so confused!

http://www.sparknotes.com/lit/mocking/themes.html

Scroll down to read about symbols. One of the things about symbols is that often you get to interpret their meaning/representation as you see it.

What do you think about each of these?

??

I just finished TKAM. The jail represents the evil discriminatory side of Maycomb. The knothole represents Boo reaching out to the children, and that there is a good side to him. The Radley house represents the fears and myths Jem and Scout had as children.
P.S.-If you need any more help, I can try to help you, since I am also working on TKAM.
brie:')