it's not only about the repetition, it's about one layer being out of phase VERY SLIGHTLY which creates hypnotizingly slow transformations over time. it takes patience but once it you got it you'll appreciate the beauty... it always reminds me of raindrops
I can't agree that this goes on too long. It probably lasts for the duration the composer intended it to, so who are we to say? Mind you, I am biased as I prefer longer pieces generally, and I particularly love this.