barbier's system was difficult,but it gave louis an idea.he worked night after night to make a simple system with dots.by age fifteen,he had dinished his system.he showed it to other student in the school,and they love it.they called it braille,after him.at age seventeen,louis graduated from the school and became a teacher there.in his free time,he copied booka into braille.someone read to louis while he made the dots.he copied the books of shakespeare and other writers into braille.the students read all the books and wanted more.the school did not want a fifteen-year-old boy's invention to be better than their own heavy books and would not let student read braille books.nevertheless,the students continued to read them.finally,after twenty years,the school agreed to use braille.louis braille spent the rest of his life trying to tell the world about braille.but nobody cared.louis was unlucky again. he became very sick.even when he was sick in his bed,he continued to write books in braille for the student at his school.a few years later,louis braille died at age forty-three.two years after he died,schools for the blind began to use his system.
today,we use braille not only to write words in all languages but also to write math and music.blind people send braille greeting cards,wear braille watches,type on braille keyboards,and take elevators with braille controls.louis braille had no idea how many people he had helped.on the door of the house where he was born and the words"he opened the doors of knowledge to all those who cannot see."