Progress equals a trashed planet since mankind is too busy altering it. BTW find the classic definition of Caedes here. Enjoy yourself today (o: because you don't know what tomorrow may bring.
We could take a photo of a portion of something (like the manhole cover), something viewed through glass, something seen from a different light, etc. Point of View is also a subject that could be implemented by graphic artists, as well. Many of John (Casechaser's) pieces of art are from a particular point of view, for example.
Leading lines are elements in an image that pulls the viewer's eye toward the principle subject in the image or guides the eye around the image without leaving the image. For this contest the more obvious the leading lines, the better.
This comment replaces my original post.