1) Rule of 1/3s
2) No large areas of empty space
The extreme position of the apparent subject (Print upper left) is balanced by the extreme diagonal opposition of the the 'light switch' (lower left) and 'the switch' provides a real world limit to the empty space which is not provided by the border. If 'the switch' had not been included focus would remain in the upper left corner. 'The switch' provides a non-competitive focal point (due to its size) which draws the attention of the viewer across the frame and allows the texture of the wall to become a feature of the whole.
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