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Twisted ring. Focus secret
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Focus Description:
To show the focus, you need a wide rubber ring, which is initially held, as shown in fig. 41. Then it is twisted twice; this is done with the help of the thumb and forefinger, which must be moved in the directions shown in fig. 42 arrows.
Have someone remove the ring from your finger, grasping it in exactly the same way as you held it, i.e. so that the right thumb and forefinger hold the ring at the top end, while the left thumb and forefinger at the bottom. Now offer to straighten the ring (i.e., get rid of twists) by changing the position of the hands, but, of course, without opening the fingers.
No matter how much the viewer moves his hands, in the end, he will have to admit that he cannot do this. Then you carefully remove the ring from his hands, taking it exactly as you held it originally. Then very slowly lower your right hand and raise your left, as shown in Figure 43.
When you do this, the twists miraculously disappear before your eyes.
Focus secret:
The twisted ring, together with your arms and body, form some topological structure. When the ring is taken by the viewer, a "left version" of this structure is obtained, which is topologically significantly different from yours. In this case, it is impossible to get rid of twisting.
Author: M.Gardner
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