This is so cool. Look at the image below and figure out whether the girl is spinning clockwise or anticlockwise. This was first published in the Herald Sun in Australia and later featured in The Digital Journalist and now referred to by me.
Footnote: For another amazing ‘illusion’ go here….
Reza Ali's The Right Eye 
Melanie Machado
November 12, 2007 at 12:18 am
The woman is spinning both ways. She switches directions. Very cool indeed!
davidhead
November 18, 2007 at 10:30 pm
Intriguing!
I wonder if you would be kind enough to consider being one of the first bloggers to take part in this:
http://mencap.wordpress.com
4 down, 997 more bloggers needed!
Thanks
David