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Creative technical art can attract attention and communicate technical messages by eliminating detail and focusing on specific points. Cartoons can carry a message by exaggeration or by transferring touchy personal characteristics away from the trainee. (Humor is used only to make a point memorable, not for entertainment, which is distracting.) Interpretive sketches and simplified drawings can show function or underlying principles of operation and can be used to impart human or animal characteristics to machinery. When-and-if (WHIF) charts can expand on a sequence of events or show cause-and-effect relationships. Each drawing must have a specific purpose to be effective.