Lighthouse lights are unique because lights shining along a coast must differ from one another[1]. Not two lights exactly alike should be placed near one another unless they are close and intended to be used together[1].
The necessity for distinctiveness has given rise to the employment of different well-marked peculiarities in lights, simple in character, that may be easily and immediately recognized by the navigator[1]. Lights can be fixed, showing continuously, or not show continuously, but are broken by periods of darkness[1]. With these characteristics, the system in operation is understood by all nautical men[1].
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