http://www.grand-illusions.com/acatalog/Hurricane_Balls.html Absolutely amazing..... I have to buy a pair of these. These would be the perfect stocking stuffer for a child or an adult. This video of them being demonstrated is also on the page linked above, but here's a direct link to a WMV of it: http://www.grand-illusions.com/images/articles/toyshop/hurricane_balls/hurricane_balls.wmv There are also some other very cool toys and gadgets on this site. You'll be glad you checked it out.