After modeling correct writing practice of a letter on the chalkboard or dry erase board, have students sit at rug in columns of 3-4 facing the chalkboard. Model correct letter formation of the letter studied on the chalkboard. Have students copy you, using their finger to write the letter on the student's back in front of them. Have students mentally self check the invisible letter they wrote, guiding them by showing correct formation on chalkboard. Erase the chalkboard, and have students use their non-dominate hand to erase the invisible letter. After several practice runs, students turn around so the back of the column becomes the front and each student has the opportunity to write on another's back and have their own back written on. This is a great way to add a kT activity to writing and alphabet recognition in a whole group setting. This method could also be used to practice writing sight words, numerals, patterning, etc.