The billboard of Doctor T.J Eckleburg is an old advertisement that watches over the valley of ashes. The billboard also represents God watching down and judging society since it watches over a poor city.
Answer:
I think it means you cant erase your mistakes or flaws. It means that don't try to be something your not and don't be ashamed of who you are. You can't forget who you truly are in life.
Answer:
I don't know you
but..good night sweet dreams
