There’s one item you can find in most restaurants from New York to California: a poster telling you how to save someone who’s choking. Though required by law in many states, those simple greyscale instructions tend to fade into the wallpaper. Now artists are designing eye-catching, comical versions. Sean Rameswaram investigates the trend with reporter Sonja Sharp, illustrator Lara Antal, and New York Times graphics director, Steve Duenes.