The Alphabet a King Designed in His Spare Time

In 1443, King Sejong of Joseon completed a project he had been working on largely in private: a new writing system for the Korean language. He published it in 1446 in a document called Hunminjeongeum, "the proper sounds for the instruction of the people." The literate aristocracy hated it.

Korean had been written for centuries using Chinese characters, often awkwardly fitted to a language with completely different grammar. Most Koreans never learned to read because the system required years of study. Sejong's stated goal in the Hunminjeongeum preface was bluntly populist: a script ordinary people could pick up in a morning.

The design is what makes Hangul unusual. The basic consonants are stylized pictures of the speech organs that produce them. The symbol for n (ㄴ) shows the tongue touching the upper teeth. The symbol for k (ㄱ) shows the back of the tongue raised toward the soft palate. Add a stroke to a basic consonant and you get its aspirated version (ㄱ becomes ㅋ). Vowels are built from a vertical line (the standing person), a horizontal line (the flat earth), and a dot (the round sky), combined to mark where the sound is made in the mouth.

Adoption was slow and bitter. Yangban scholars petitioned against the new script and at one point got it officially banned, regarding Chinese characters as the only proper writing for serious thought. Hangul didn't become the standard script in Korea until the late 1800s, and didn't fully displace mixed-script writing until after independence in 1945.

Linguists tend to call Hangul the only major writing system whose origin and design principles are fully documented. We know who, when, why, and exactly how. That's vanishingly rare.