ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
A blind woman reading with the aid of the braille communication system. The braille system was devised by the French teacher Louis Braille (1809-1852) to enable blind people to have access to written language. It consists of a sequence of cells each of which contains a pattern of raised dots that may be sensed through the fingers. Different patterns represent letters, numbers, punctuation marks and several short words.
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