The natural question on everyone's mind is whether the experiment worked. Do I have a more positive outlook on life today than I had a year ago? The answer? Nyes. That is, yes and no. As I wasn't a particularly negative person to begin with, I'm not sure that there was all that much room for improvement. So in my case, I think this project was (as I wrote yesterday) all about the doing. I liked having a focal point every day. And I like having a stored history of those focal points now.
So, no regrets. :-)