Leading Lines
Lines within a scene that guide the viewer's eye from one part of the frame toward the subject.
In depth
The eye follows continuity, so any linear feature — a road, a fence, a shadow, a shoreline — will be traced from wherever it enters the frame. The device only works if the line ends somewhere worth arriving at; a strong leading line pointing at nothing carries the viewer straight out of the picture.
Examples in practice
A jetty running from the bottom corner to a distant boat gives the eye a route into the frame and a destination.