Degas - Courtauld
In the Degas, the subjects are two ballerinas clad in white, shimmery dresses--you can see visual echoes of their movement--and colorful shoes and flowers adorning their hair.
The background is necessary to the painting not only for its utilitarian use simply as a placement for these subjects but for the dialogue it opens up with the subjects. The background is filled with muted browns and greens. It is not only a bit blurry, like the subjects, but smoggy. A brown cloud even seems to be coming out to engulf the foreground in the upper-center part of the painting. Furthermore, the space on the stage floor is very strange. It seems to tilt in to the line that crosses the painting (going behind the legs of the dancers)--not at all expected from a stage floor.
Now--imagine the painting without that background, just with the subjects... It's completely different! That's what's amazing to me about it. The question is, what does the background really mean in relation to the subjects? Does it represent their inner states? Someone else's inner state while viewing them? Some sinister backstory or something horrible that has yet to happen? General disillusionment? There are so many possibilities! Nothing can be nailed down. It is beautiful.
Manet - Courtauld
Similar things can be said about the Manet. The main subject is the woman tending the bar, facing us. There is so much interesting simply about her, perhaps more than the subjects in the Degas, because we see her face and it is a very interesting face, one that suggests great depth of emotion. Even more interesting is the choice to pair her with a reflection in the mirror behind her. How does she feel about all those people sitting there? The placard says they are watching a performance, but why do they seem to be facing her--is this reflective of her inner state, feeling as if they are watching her? And perhaps the biggest question of all--what is she doing in the reflection, leaning forward, when in the foreground she is totally upright? The mirror can't possibly be a true reflection. Other possibilities: is it reflecting her memory of some interaction with the man? Or simply her thoughts and wonders--maybe that interaction hasn't actually happened?
Again, the painting imagined as just the subject without the background is entirely different.
Cezanne - National Gallery
(from http://www.zucapaca.com/wp-content/uploads/Paul-Cezanne-1900-1904-the-old-woman-with-rosary.jpg)
Perhaps the same can't be said of this painting by Cezanne, An Old Woman with a Rosary. I need to go back to the National Gallery and spend more time looking at this one in person, but as far as I can tell so far, the background seems to merely reflect the deep melancholy of the woman. It doesn't open up any additional questions like the first two did. Does that make it a lesser painting? I'm not ready to make that kind of judgment yet--perhaps the dissonance in the painting is just less apparent than in the first two. The one thing that is clearly dissonant is her white hat, the only light color in the painting. I know from a little bit of research that she was a nun. So I am looking forward to delving more into her as a subject.
The idea of subject and background will be interesting in comparing paintings to poetry. One poem that comes to mind is Percy Shelley's "Ozymandias," in which one might designate the statue as the subject, the background two-fold: the empty desert around the statue as well as the frame of the whole poem being a story told by a traveler. I've been thinking more about that frame, and I didn't even notice until I listened to that strange dramatic reading of the poem over music how weirdly the poem begins. I had always somehow thought the first two lines go: "I met a traveler from an antique land. / He said, ...etc." rather than "I met a traveler from an antique land / Who said, ... etc. The first (my imagined reading) seems to make much more sense--that pause there before going right into what the traveler says. It almost seems as if the narrator, the one who met the traveler, has an agenda in retelling this story of the traveler's.
Just as an aside, Diebenkorn's painting Woman by a Large Window also has a fascinating relationship between subject and background--the background being multi-faceted in that there is seemingly a room that the woman sits in as well as a view through a window and a mirror reflecting the room and the view--and there are lots of dissonances among the parts.
Diebenkorn - AMAM