- an eye-line
- the extension of a line, or lines that point.
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This photograph is an example of an implied line by an eye-line. The eye-line of the man in the advertisement picture leads to an woman walking on the street as illustrated by the red line below.


This photograph is an example of an extension of a line. The arrow on the street leads the viewer's eye to the direction of the two women running on the street as illustrated by the red line below.
