Two men who created modern-day icons have passed away. ROBERT MOON, 83, a lifetime postal worker who in 1963 saw his 20-year-old dream to have the nation adopt what would become known as ZIP codes, died last Tuesday at a hospital in Leesburg, Fla., 34748 . . . “Happy Face” creator H.R. BALL, 79, who gave the world the smiling, yellow visage known as the “Happy Face,” has died of liver failure. He, too, saw his creation come into being in 1963, when he was working for a Massachusetts ad agency and one of its clients, an insurance company in the middle of a merger, asked him to come up with a way to soothe employees. He claimed to have been paid only $45 for the drawing, which he never trademarked. The logo has appeared on millions of items ever since, including a U.S. postage stamp.