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 seventeen, Louis graduated from the school and became a teacher there. In his free time, He copied books 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 students read Braille books. Nevertheless, the syudents continued to read them. Finally after twenty years, the school agreed to use Braille.