The "butterfly effect"? Maybe that would give some food for thought, too. I'm gonna ponder about that for awhile.
Also, someone else mentioned the fragility of a butterfly. Yet, if the butterfly effect is true, it would be potential great power, wouldn't it? So that if, say, the Fool and the World card appeared together, maybe that would give the Fool added "oomph" in the reading because if a butterfy's wings can cause a tornado on the other side of the world, then the Fool added to the World card might give the fool much more importance or vice versa.
I probably didn't explain myself accurately to what I mean, but maybe someone else will get the gist who can explain it better than I did. Or else maybe I'm just demented.