I like to look for repeating patterns - sometimes the subject might appear pedestrian but the shapes it makes are interesting. In this case I filled the screen with a close up of some trolleys. I liked the way the pattern repeats into the distance as it slides out of focus.
To get the effect I used a wide aperture and focussed on the second trolley in. Unfortunately, this also meant that part of a sign lower down was also in focus (as it was the same distance from the lens) so I cropped this out of the shot.
Canon EOS-1Ds Mark II, f/2 @ 35 mm, 1/800, ISO 200, No Flash