Description
A small metal chain is displayed on the table. The right hand side is picked up and the circle is re-laid down in the form of a figure eight.
It is demonstrated that one side of the figure 8 will catch if a finger is placed within it while the other side will not catch when a finger is placed within it.
A challenge is made that they will never be able to pick which of the loops will catch their finger.
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Needless to say, you the magician are always right..
