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Inspired tassels Ali Bongo, this tour is a classic.
You present two sticks crossed at their ends with cords of different lengths (short and long).
When you pull the shortest cord that stretches while the other wand cord narrows.
you can simply explain this effect by comparing the principle of communicating vessels.
Your audience will think immediately that the two strings are connected, all they touch at their ends.
You then separate the two sticks and have cross by repeating the same operations with the same success. amazement of the congregation
You can convince the remaining sceptics putting a baguette under his arm and the other in the hand, the strings still interact ....
a Indeed a little more surprising every minute!
two black rods 24 cm with white tips.