There actually isn't any real symmetry here, that I can see. What I liked about it is that there ought to some, and that on first dight there is. Also, the combination of natural sunlight and the halogens uplighting the upper arches appealed to me, and I hope I've captired an impression of the level of light and shade within the cathedral.
Few post-pro tricks: a little lightening (belive it or not), and a slight blur (if I recall) to correct some of the starker lines.
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