I think what the gist of this theory is that a small action can in turn create larger actions and bigger changes as it links to another and another action. Does this sound so far fetched? Not to me.
I know that if I am feeling down and I hang out with some stupid optimist, it is much more likely they will bring me up to their level than that I would drag them down. They are the butterflies in our lives and who knows what they change when we do not use the scientific data to follow up?
I also know that just watching a butterfly as it goes greedily from blossom to blossom with such little effort makes you feel better...much better. Just try it! Even on a hot day it somehow has a cooling effect.
And this last below is my favorite, because he/she is so small and easily overlooked.