This song is hard to figure it out. I don't agree with any of the meanings I've read soo far. But I can't come up with my own. It is a complicated song and I've though about it for hours, days even. My general idea though would be that he is singing to a person that has been on the outside of society for a long time: "I'm looking at you through the glass. Don't know how much time has passed." I think the glass is symbolic for socal boundries. "How do you feel? That is the question. But I forget you don't expect an easy awnser." I think from this, said person is going trough a hard time so they are isolating themselves from other people. "sitting all alone inside your head." This line also supports the isolation theory and how the person is thinking about their problem. That's all I have so far. If anyone can build on it, that would be nice.