A research team redesigned the labels on medicine bottles after noticing a recurring problem: patients could read the words but could not quickly distinguish daily instructions from emergency warnings. The team tested three changes: larger action verbs, a separate color-independent symbol for urgent information, and shorter lines that kept each condition beside its instruction. The result was not that decoration made every bottle safer. Rather, the tests revealed a principle: visible hierarchy helps readers decide which information requires immediate action and which information explains routine use. The colon after problem introduces the specific difficulty, the colon after changes opens a list of examples, and the colon after principle states the conclusion drawn from the tests. Each mark points backward to an unfinished idea and forward to the information that completes it. Reading only the words after a colon would miss the scope established before it.