This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
There are many ways of making a five-pointed star, but the one illustrated is new and easy to apply. A long strip of paper, which should be transparent, is tied into a knot. When the ends A and B are drawn tightly, the paper strip takes the position shown in C. The end A is folded forward, or in front of the knot; then the whole is turned over and it will take the position shown in D. Hold the paper to a good light and a perfect five-pointed star will be seen. - Contributed by J. J. Kolar, Maywood, Ill.
Ill: Holding the Knot to the Light a Star will be Seen, Shown by the Dotted Lines