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1
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blue book
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Japan
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In China and Japan, the color blue symbolizes trust and reliability, so a 'blue book' may be associated with official documents or important records.
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1
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2
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blue book
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Japan
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In China and Japan, a blue book may be associated with education, such as an official exam guide or textbook used in schools.
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1
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3
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blue light
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Japan
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Blue light is often used in streetlights and public spaces as it is believed to improve people's sense of security and help to reduce crime.
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1
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4
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blue light
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Japan
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Blue light is often used in skincare products for its perceived skin-rejuvenating properties.
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1
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