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 keybords , 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 are the words " He opened the doors of knowledge to all those who cannot see.