“Crawl through a Postcard,” Friend, July 1983, 23
Crawl through a Postcard
A person crawling through a postcard may seem about as impossible as an elephant squeezing through a letter slot, but it can be done! In fact, the largest person you know could manage it quite easily.
The secret is to slit the card as shown (dotted lines only). It will then stretch out into a large circle through which anyone can wriggle with the greatest of ease. The more slits you make in the card, the larger the circle will be.
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Crawl through a Postcard