These large metal rings are in a park in the Melbourne CBD. Equipment used Canon digital compact. Shot taken above the park area, when I had the idea for the rings as a subject:
Image 1 -taken at 170mm (equivalent)
Image 2 – taken at 28mm (equivalent)
As you can see, even though I walked a straight line between the two shots (see red bollards and the ring in the same position in the background of both images) there is a considerable change in the perspective between the images.