A Grill for Secret Writing

A grill consists of a square of paper in which square holes have been cut in a certain way. Suppose that the paper consists of a square with four smaller squares cut off. Place the square on a piece of paper and write the first four letters of some text in the holes. Then, turn the grill a quarter turn and write the next four letters. Continue the procedure for two more turns.

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DETAILS

Reference
[1] H. Lysing (J. L. Nanovic), Secret Writing: An Introduction to Cryptograms, Ciphers, and Codes, New York: Dover Publications, 1974, pp. 36–37.
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