The story behind the coin
Louis Braille went blind as a small child in France after an accident with one of his father's leatherworking tools. By fifteen he had invented something that would outlast empires: a system of raised dots that let blind people read and write for themselves, with their own hands, instead of waiting for someone to read aloud to them. He was born on January 4, 1809. Two centuries later, the United States decided to put him on a coin.
Congress authorized it with the Louis Braille Bicentennial–Braille Literacy Commemorative Coin Act, signed into law on July 27, 2006. A commemorative coin is a special-issue coin Congress orders to honor a person or event — it is legal tender, but it is made for collectors, not for your pocket. This one had a second job built into the law: raise money for Braille literacy.
But the people who pushed for this coin wanted more than a portrait. They wanted the coin itself to do what it honored. So they asked for something no American coin had ever carried — Braille that a blind person could read by touch.