Back writing, the method recommended by Peter Young and Colin Tyre in Teach Your Child To Read—for children who have difficulty distinguishing between some letters. Place a large sheet of paper on a smooth wall at your child’s shoulder height. Give him a thick crayon or felt-tipped pen, so he can write on the paper at arm’s length. Then, with your child facing the paper, write the first letter on his back, with your index finger, as if you were printing a ‘lower-case’ non-capital letter. Make sure he can feel it, tell him what it is, and ask him to write it on the paper. But do only one letter at a time. The system works because of the power of “muscle memory”: the ability to memorize through bodily actions. The illustration is from FUNdamentals, by Gordon Dryden and Colin Rose.