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Travelers look at a clock at the airport to know a time difference with their destination. It is not easy to find one that I want among several dozens of clocks. The world clock divides the whole world into 24 groups based on the GMT and has 24 hour hands. People can find time by nations at a glace without using alphabets by employing the arrangement of the world map. The regularity coming from the minute difference in angles of each hour hand will make a new 3D pattern and this is the symbol of permanence. The LED of the ending part of hour hands makes images of the pattern more dramatic.