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This pattern was commissioned to celebrate an Hangul Day event. According to Hunminjeongeum Haerye (1446), the vowel characters of Hangul, the Korean alphabet, were modeled on the yin-yang principle of Taoism: the dot ( · ) signified the yang, the sky; the horizontal stroke ( — ) symbolized the yin, the earth; and the vertical stroke ( | ) referred to the median, the human. The patterns are composed of the three basic vowel elements, set in three different weights.