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This tactile reading system uses raised dots in various formations to represent letters and punctuation.
How was it invented?
In the 1800s, Frenchman Charles Barbier developed a system of night writing
It was based on the Polybius square, an ancient Greek system
In 1821, Barbier took night writing to the Royal Institution for Blind Youth in Paris.
But Braille's work was largely ignored until years after his death.
Nowadays, Braille is used in 140 languages, and has special forms for math and music.