This first example of diagonals in an image relies upon the effect of perspective. The lines of the roof going away from the viewer are strengthened by the lines of the balcony and the frontages of the lower shops.
The diagonals in this image of part of a roof have been photographed to create a strong abstract image. Interestingly I find that my eye is always drawn back to the centre of the image possibly because of the suggestion of a 'bend' in the trusses in the middle. The trusses are two sides of a triangle meeting at the apex of the roof but the camera has flattened the angle offering apparently straight lines.
When taking this shot I deliberately placed myself so that the rope created a diagonal from the corner of the photograph to the bow of the boat. The effect is to draw the eye of the viewer towards the centre of the image and the main subject - the boat.
If the subject of the photograph is heading directly towards the camera and, other things being equal, it will appear stationary. In this particular case the angle of the people and the car they are in suggest movement because our experience tells us that such an angle is the product of speed.
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