Smoke Signals

Smoke signals are a form of visual communication that can travel over long distances and are one of the oldest forms of long distance communication. Smoke signals were used to warn others of enemy attacks in Ancient China, as they were able to be seen from tower to tower along the Great Wall. Native Americans used this form of communication as well and each tribe had their own system. Usually the placement of the signal on a hill would indicate different meanings. Today, smoke signals are still used in Rome to signify when a new Pope has been selected.