using a graphEdward Tufte has this discussion about a graphic that shows how to spot a hidden firearm.
"Color is used to highlight how the gun moves and how the gun reveals itself, short visual noun-verb sentences that indicate the key signs that help detectives to spot someone carrying a hidden handgun. Thus the color usually has a distinct substantive point and is not just used to depict surfaces or to decorate the news."
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Hidden hand gun
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