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You have a matchbox with a thread (about 2 1/2
feet long) going through it, and two small rings tied to both ends of
the thread. Put one ring on your forefinger and hold the box with your
thumb and middle finger while your left hand is holding the lower end
of the thread with other ring (see Figure 1).
Ask someone to show on the thread any place (it's shown with the red
arrow). Now let the matchbox go. It will slide down and stop exactly
where you were asked (see Figure 2).
Do you have any idea how does this trick work? |
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