Where Do Airplane Safety Signs Come From?

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So many visual elements go into creating the sterile and unpleasant design of airplanes. But none is more important than those neutral-looking safety graphics that feature people who look like upside-down exclamation points.
These little guys get into all kinds of mischief. Sometimes they're trying to open the emergency exits. Sometimes they're strolling around the airplane bathroom, even when they're not supposed to be.