by dat8962 » Dec 13th, '08, 14:19
Just an idea, if you have your thread/string tied around a bobbin you could block one end of the centre well, and pour some in the other end to tip out at the right moment.
Member of the Magic Circle & The 2009 British Isles Close-Up Magician of the Year
It's not really an optical illusion - it just looks like one!