Here's a cute pictorial on surefire ways to trick your cat into doing what you want --- with a circle made from just about anything.....

http://en.rocketnews24.com/2014/10/24/cats-trapped-in-circles-japanese-blogger-shows-the-best-way-to-outsmart-your-kitty%E3%80%90photos%E3%80%91/

haha..  I don't have a cat... but i will surely experiment it on others... :D