Imagine a technique that is totally impromptu, can be done surrounded with borrowed materials, and no evidence of trickery can be found. Imagine having someone print any piece of information on a borrowed slip of paper, which is then folded and torn to shreds. Yet you can instantly announce just what was written on it.
1st edition 1980, 18 pages; PDF 20 pages.
word count: 4323 which is equivalent to 17 standard pages of text