Literal lines do not exist in nature, but are the optical phenomena created when objects curve away from the viewer. Nonetheless, line-like shapes are for all intents considered line elements by the artist; for example, telephone and power cables or rigging on boats. Any such elements can be of dramatic use in the composition of the image. Additionally, less obvious lines can be created, intentionally or not, which influence the direction of the viewer's gaze. These could be the borders of areas of differing color or contrast, or sequences of discrete elements, or the artist may exaggerate or create lines perhaps as part of his style, for this purpose. Many lines without a clear subject point suggest chaos in the image and may conflict with the mood the artist is trying to evoke.
Movement is also a source of line, and blur can also create a reaction. Subject lines by means of illusion contribute to both mood and linear perspective, giving the illusion of depth. Oblique lines convey a sense of movement and angular lines generally convey a sense of dynamism and possibly tension. Lines can also direct attention towards the main subject of picture, or contribute to organization by dividing it into compartments.
The brain often unconsciously reads near continuous lines between different elements and subjects at varying distances.
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