Design of a lighthouse that emits different colors on the left and right ++

　This time, I am reposting a trivia-oriented question.📖

　This photo shows two lighthouses in a harbor, but they appear to be installed as a "pair."

　Can you tell which side, the right or the left, leads to the open sea?　Please answer without being misled by the appearance of the land visible in the background.🤔

👇　☟　The answer follows below　☟　👇

👈The left side is the open sea, and the right side is the land.👉

　For lighthouses that mark the entrance to a harbor⚓, such as those on breakwaters, the color of the light is determined so that you enter the port🚢 with the red light on your right and the green light on your left. (As in the photo, the buildings themselves are red and white in order.　Also, "white light," which is neither, is used for other signs, such as lighthouses on capes that serve as landmarks or lighthouses on rocky areas that act as obstacles.)

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　There is also another example that contains some similar "design" standard elements.

　You might notice this when looking up at the night sky,

what is it that, like a lighthouse, has a "green side" and a "red side"?

　It is easiest to see at an airport, but if that is not "close to home" for you, please try looking up at the night sky.🌃

(Though it is difficult to confirm at a "high altitude" of several thousand meters) if you spot the flashing lights emitted by an aircraft, check to see that colored lights are lit on both sides (the tips of the main wings).
One is green. The other is red. Did you know that?

This on an aircraft ✈ is called a "navigation light."
Red light on the left wing / green light on the right is the global standard. While in operation, by observing the lighting of the left and right navigation lights of other aircraft flying nearby (whose presence can be visually confirmed), one can determine the direction in which the other aircraft is heading ☝

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Furthermore, what is the point of the similar design between these two (the left and right of lighthouses / aircraft lights)?

The keyword common to both installation examples is [ensuring safety] ☝

Although these are "mechanisms" that have no direct relationship to us, when you observe them, you notice that various "ingenuities to prevent accidents" have been implemented 💡
Airplanes pursue safety in multiple layers by making comprehensive judgments based on multiple sources of information, starting with instructions and information from ground control, while also not neglecting visual confirmation (*^^)v

+++ As an aside, when fishing spots at fishing ports 🎣🐟 are described as "the red lighthouse breakwater," you can guess that "I should walk to the left (facing the sea) to access it" 👍
Although the sample photos all show them in pairs, there are also many places where there is only one side 😄

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