This is the underside of a children's climbing frame in a playground. The yellow comes from another part of the structure. The centre section is also blue, but is much smoother and more reflective than the blue bars sticking out at the sides. I centred the focus on the 'crease' where the yellow section is. The shooting angle puts the top bars more or less in focus as well to give the impression that the focus closer/higher in the image than if you just look at the centre bar and the reflections, which I intended to be the central point of attention for the subject. This was at f/16 and ISO200 and I decided not to go to ISO400 or stop down more for shutter speed and image quality reasons.