Based on the information above what does the green chamber represent?

as for symbolic actions, the narrator's tearing down the wallpaper in an attempt to find the "woman" in the wallpaper represents her struggle to retain or regain her sanity.   the wallpaper has been part of her confinement and by her tearing it down, she is freeing herself from that confinement.

may i ask what topic?

dioneo just might be like one of your friends. he is a good looking guy that can say whatever he want and get away with it. he's brings life because he can sing and play the lute. he is also dangerous because he can convince you to do anything for him because his wit is so sharp, you can not resist. dioneo is determined to take the next logical step and initiate a small campaign for freedom of speech. he does this by begging to be released from telling stories that conform to the daily theme. then, during his own time, he chooses a themes that are scandalous and he gets the response he expects.