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The Importance of Implied Line
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Some edges are clear, with a defined start and finish. But when the edge turns a corner or flattens out (such as along the bridge of a nose), the line should not be drawn, but implied. The artist needs to decide where the drawn line ends. The choice shouldn't be arbitrary, but should aim to help the viewer make sense of the form. Be consistent in your handling of similar forms and edges. The transition from edge to plane, or the line along an edge which isn't sharp, may be implied or suggested by making breaks in a line, a dotted line, or some variation between the two. A simple form, such as this apple, might offer little opportunity for use of implied line. Lineweight - pressing more or less heavily - may also be used - examples of this to follow.
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