Persians use flags, mirrors and smoke to signal

In ancient Persia, communication across long distances was often achieved using an ingenious system of signaling from summits. The Persians employed a combination of flags, mirrors, and smoke signals to convey messages quickly and efficiently. Flags were used for visual signaling during the day, with specific patterns or movements representing different messages. Mirrors, or heliographs, reflected sunlight to send coded signals over vast distances. Smoke signals were also a crucial part of this communication network, especially for transmitting warnings or urgent information. This sophisticated signaling system allowed the Persians to maintain effective communication and coordination across their expansive empire, highlighting their advanced understanding of visual communication techniques.