'Wall' in the Bible

My loved one is like a roe; see, he is on the other side of our wall, he is looking in at the windows, letting himself be seen through the spaces.

If she is a wall, we will make on her a strong base of silver; and if she is a door, we will let her be shut up with cedar-wood.

I am a wall, and my breasts are like towers; then was I in his eyes as one to whom good chance had come.