Light can be used as a means of communication. Throughout history, light has been used to communicate many things. Mariners would use flares in cases of emergency to signal distress, lighthouses are used to navigate ships and boats, heliographs reflected light upon mirrors to signal during military operations, and stop lights are used to communicate the flow of traffic. Light is a very important communicator when driving as well. It is used to signal turning and stopping, as well as to signal to other drivers on the road your location while driving at night. A famous example of the use of light communication was during the American Revolution when Paul Revere signaled to the militia the advance of the British troops, one if by land, two if by sea. The sun, a light source itself, communicates time, morning and night. There are many ways in which light can be utilized to communicate that can arguably be traced to the beginning of time.
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