The tree was originally supposed to be surrounded by flames drawn in chalk, so the piece as a whole would represent the destruction that was necessary for that wall to be built, but I abandoned this idea when I realized I was neither skilled nor tall enough. Unfortunately, I wasn't able to completely wipe the chalk off the wall, evidenced by the red smudges to the left. If I took more time to do it I probably would have, but the tree was about to fall apart for a third time and I wanted to get the picture taken as soon as possible.
I'm afraid I completely forgot to redo it so that it 'owned' the space. I'm very sorry about that.
Overall I'm not happy at all with this piece, but I do not have the time, patience, or ideas to recreate/fix it.
As a side note, this was rather heavily photoshopped. In the original photo, which I do not have with me at the moment but will probably add later, the tree was barely visible, the leaves not at all. However, I couldn't really remember how to reach the tools you showed us in class (and I'm fairly certain I used a different version of PS anyway) so I improvised.
EDIT: I did not realize how saturated this looks on other computers. It seems fine on my laptop, but then I saw it on a Mac and it burned my eyes.
Also, here is the un-photoshopped version for those who are interested:
