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Line is the simplest graphical means of expression. It can be used to express shape, direction, emotion and movement. Although lines do not occur in nature, we have learned to use and understand them as defining edges, even as children (Saw).
A contour line is any line that follows a form creating an outline that defines a shape that is recognizable. Within an object, there are more subtle lines or edges such as folds, color changes, value changes and overlapping parts of the object. By defining these edges with lines we begin to add the impression of volume to an otherwise flat image(1).
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