Several years ago I had a room mate with RP. She loved to play cards, and had her deck marked in braille in the upper corner. She taught me to see thelight coming through the braille markings from across the table so I would always know what she had in her hand.
No one ever questioned the fact that she always insisted that she sit with the light to her back. (It allowed me to see the braille markings easier.) Needless to say, we were very hard to beat at cards, given the little cheat scheme we cooked up!