the art of the jigsaw puzzle seems of little substance, easily exhausted, wholly dealt with by a basic introduction to Gestalt: the perceived object ... is not the sum of elements to be distinguished from each other and analysed discretely … you can look at a piece of the puzzle for three whole days, you can believe that you know all that there is to know about its colouring and shape, and be no further on than when you started. The only thing that counts is the ability to link this piece to other pieces.