Dan, over at the excellent ThoughtLights, has posted an interesting follow-up to my "Music as Image / Image as Music" post. Among other things, reading his post made me realize I'd never really written an effective conclusion to my original post. (And just yesterday, I was criticizing lots of student papers for having ineffective conclusions!) So, my comment to his post might help to make clearer what I was trying to say.
In other words: read this.