This blew my mind. I thought it was broken until I stared at the image for about 5 minutes and I finally managed to get her to spin the other way. What a mind-trip! Thanks Ero for pointing this out. Check out Ero's blog here "nzight's blog". He has some pretty cool insight on this and his blog post and animations help me to finally get the illusion to work. The best way I was able to change the direction was to stare at the edges of the image and not focus on the rotating lady. It would then change direction and I'd see it happen in my peripheral vision and could return my focus to the center thus locking the new rotation direction into place.