There are probably very good biological & psychological reasons ( human biologists, etc, please help me here) but why when, in the Western world, we read from top of the page to the bottom of the page do we look at photographs & other pictures from bottom up? The reason that I ask is that I was about to critique a sequence of three photos (the identical shot with three different edits) on another site. I felt that (from the sequence as described by the photographer) the bottom photo (in his mind the first) should be at the top. Then I realised that he was correct, by convention. I have no problem at all with that and held off on my critique. But why is it different with pictures than words?