There were two ways of looking at life; or two extremes of viewpoint, anyway, with a continuum between them. One proposed that every human action necessarily carried with it the obliteration of every other action which might have been performed instead; life therefore consisted of a succession of small and large choices, expressions of free will, so that the individual was like the captain of some paddle steamer chugging down the mighty Mississippi of life. The other proposed that it was all inevitability, that pre-history ruled, that a human life was no more than a bump on a log which was itself being propelled down the mighty Mississippi, tugged and bullied, smacked and wheedled, by currents and eddies and hazards over which no control was possible.