If you condense every text passage into a one-dimensional sentiment score, then all texts are going to look like graphs of rising and falling sentiments to you.

If you condense every text passage into a one-dimensional sentiment score, then all texts are going to look like graphs of rising and falling sentiments to you. Nothing unexpected there. I actually liked the charts, but I didn't see much evidence that there's anything universal at play here that isn't just an artifact of this methodology.