Every once in a while I come across something which reminds me of the difference between photography and the graphic arts [drawing and painting]. We're all aware of the fact that photography includes a constantly changing technological component but there are other differences, too. One is the speed with which new concepts take hold. In the graphic arts a major 'movement' such as impressionism may take many years to establish itself. In photography, something like HDR seems to spread like wildfire. In the graphic arts there's been little or nothing new in brushes since the introduction of nylon bristles. In cameras there seems to be a new development every couple of years. The rapid spread of techniques and new gear in photography can lead to another interesting phenomenon: fads. This was nicely demonstrated to me last night as I browsed through a book in my stacks, 'Composition in Art', Henry Rankin Poore, Dover Publications, Inc, New York, 1976. The author covers the problems faced by an artist in composing a picture without a single mention of ... the 'Rule of Thirds'!