They are obsessed with certain symbols, like doctors and such. It's just repetition of their obsessions that makes it seem like they are linked. They don't have any premeditated conceptual continuity. They just keep going to the river and bringing back fish because they catch them. Same with their art. They like certain things and it gets repeated and then strung together. It's not as well thought out as we would like to believe. Just go see them in concert. It's a routine. Nothing special. They don't connect with audience. They don't have an overall story to tell. Its just a bunch of stand alone pieces (albeit amazing ones) glued together with ambient noises. The fact that there is so much reading in, is proof enough that nothing's there.