Braille
Valentin Haüy was one of the first French who was interested in the problems the blind had when they wanted to communicate. Haüy was born in Picardie in 1745, and studied languages at the university in Paris. First he studied deaf people who could not speak, then blind people. In his opinion the biggest problem of the blind was that they could not read. He then invented a system which allowed them to read and write sentences and to do mathematics. Later he started a school for blind children. His writing system used two columns which had between one and six positions each. Vowels had a dot in the left column, for example.