Time, change, and motion are understood via many methods of artistic shorthand. Some artists incorporate special visual effects in their drawing to indicate movement, speed, or action. The nature of movement is often reinforced by drawing dynamic marks (e.g., "speed lines") around the edges of the figure or object, or by using sketchy or intentionally "blurred" outlines.
http://www.adh.brighton.ac.uk/schoolofdesign/MA.COURSE/09/LMovement.html
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