Watch the video and you will be amazed at the motion of those wooden balls which appear to roll 'up-hill' against gravity as if drawn by a magnet at the center!!
This is the work of a mathematical engineer from Japan, Kokichi Sugihara, who has created this illusion very tactfully using the basic intuition that gravity works. This construction won the 2010 Best Illusion of the Year Contest.
The steps to prepare one such illusion for yourself go to this link.
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