This will be a lot easier to demonstrate than to tell you—so draw the numbers one to ten on a postcard in two rows of five and get a pencil. The numbers, by the way, should be evenly spaced running more or less along the top and bottom edge of the card. Now hand the card to someone and tell them to look at the numbers and then to encircle any one they like. You will be able to tell which number they choose by the POSITION of the pencil on the card during writing. That is the principle, now we may progress it a step farther. Make a long list of say twenty cities of the world, and memorise it—or have a duplicate list. After a bit of practice, you will be able to tell any city that it underlined simply by watching carefully the position of the pencil when used.
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