Here we have an aspect that breaks the rules. The following shot is symetrical about the centre axis and also the main horizontal line is central. Normally this would look unpleasant. Indeed if you remove the red bus with your finger you can see how it looks like a typical boring tourist shot.
However by patiently waiting for an old "routemaster" to rumble by everything is changed. Suddenly the expanse of sky has something to react to. The red is very strong and it only takes a little to balance the big blue sky. The up down tension caused by your eye being continually dragged down to the bus, coupled with the placement of the bus in the arch is enough to counteract the symmetry about the vertical axis.
Fortunately in Painter you can make a "routemaster" hose and instead of waiting around for half an hour you can just hose on as many routemasters as is necessary to make your composition work.
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