Today marks the beginning of spring, according to the old calendar, so this is “first day of spring; very lucky”, a kind of motto for this day. I have heard because all four characters are bilaterally symmetric, the phrase looks the same when seeing both from the front and the back, and so it creates ultimate happiness.
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立春のためのモットーのようなものですが、4字ともが左右対称なので、表から見ても裏から見ても同じで、それで縁起がいいのだと聞いたことがあります。
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