The document discusses several methods of communication used by indigenous peoples long ago, including drawings on cave walls, smoke signals, mirrors, fire signals, blanket signals, and sign language. Cave drawings told stories of daily life, battles, and heroes. Smoke signals used different puffs of smoke to send messages over long distances. Mirrors and fire signals were used to signal locations, and blankets were waved to warn of danger. Since tribes spoke different languages, they developed a common sign language using hand movements to communicate across groups.