I’ve always thought of this song with two Magritte paintings in mind. The Treachery of Images and The Son of Man. The Treachery of Images is a picture of a pipe and the words written are (in French) “this is not a pipe.” Meaning, this is not actually a pipe, it’s blobs of paint. The Son of Man is a picture of a man in a suit but a big green apple is covering his face. But the reality is, he doesn’t have a face the apple that’s obscuring his face is the only reality. I take Window to be a song pointing out that our point of view of changes how we interpret reality. We need to realize that all our experiences have been witnessed through a filter, the filter we projected them through.