Originally posted by swampfrog
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There is the issue of visual field to consider. Visual field, both mechanically and philosophically, refers to the limits of the frame only showing what is intended to be seen or illustrated within the boundary of the frame, but there of course is a much larger world outside that boundary that is left to the viewer to construct using their imagination. Looking at my image you attached above it is easy for the viewer to imagine they are standing on earth looking up at the tree, because prior experience tells the viewer that that is typically how an earth bound creature often (yearly) experiences such a scene. Positioning the trunk of the tree (actual lines) where I did (bottom left corner leading to a rule of thirds intersection point) allow me as artist to manipulate the viewer's eye to follow the trunk (lines) and get lost in the yellow field of colour, leaving and returning again and again via the branches, as you have noted with your drawn lines.
In your night image of the scaffolding you have expertly done the same, whether or not you knew you were doing it. The most important lines in that image are the seam lines in the sidewalk. Everything else just accentuates those lines leading the eye off to the gateway, which happens (it was planned by your great photographic eye) to sit exactly at a rule of thirds grid intersection point. Simply, our head spends much more time looking down at where our feet can take us, as opposed to looking up or even straight ahead, precisely because walking is our standard mode of mobility.
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