Instead of a search for the perfectly proportioned image containing the 'soul' of the knowledge to be remembered, the emphasis was on the discovery of the right logical category. The memory of this system of logical categories and scientific causes would exempt the individual from the necessity of remembering everything in detail ... The problem of memorizing the world, characteristic of the sixteenth century, evolved into the problem of classifying it scientifically.(James Fentress and Chris Wickham, Social Memory, 1992, 13)