Blind people read by moving their fingers on raised dots. These can be on metal or plastic or can be pressed out of the paper from below. Different combinations of the dots result in letters, numbers, and punctuation marks. This dotted script was invented by 16-year-old Louis Braille in 1825. He had become blind when he was a small boy. In 1845, William Moon developed another script for the blind. It consists of rounded symbols, which are based on the letters of the alphabets. People who are not born blind and become blind only later in their life find it easier to learn the Moon script as compared to the Braille alphabet.
