1. Make a zero about 1/2 inch in diameter on a sheet of paper that is lying on a tabletop. Raise your pen or pencil above your head, close your eyes and make a dot on the paper as close as possible to the center of the zero. How close did you zero in on the zero? Try again. Any better luck? Now try with your eyes open.
2. On a lined sheet of paper, sign your name. Place your pen or pencil after the signature on the same line, close your eyes, and sign your name again. Try writing other words. Can you tell the difference between what you wrote with your eyes closed and what you wrote with your eyes open?
Most people find that looking the zero between trials improves their performance. Practice also improves performance. Vision seems to be essential for real accuracy. However, vision is not necessary for reproducing written words. We are used to the "feel" of writing from the proprioceptors in our hands and fingers.
