"Always it is interesting, is it not? to look rearward from the present moment to those earlier present moments from which it has arisen. If one perspicaciously from effects to causes traces the development of anything, one sees with clarity how infallibly one thing leads to another. And yet sometimes it is easier from the present to look forward and predict an outcome than it is from an outcome to look backward and determine a cause. ..."
The Bat Tattoo, Russell Hoban